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Amazon Search: How Product Search and Filters Work for Buyers and Sellers
Published: February 27, 2017
Last updated: April 23, 2026
Marissa Incitti
Marissa Incitti leads research and content at Feedvisor focused on Amazon, Walmart, and the broader e-commerce marketplace ecosystem. Her work covers retail media performance, pricing strategy, and how AI-driven discovery is reshaping how brands compete across marketplaces. Prior to Feedvisor, she worked in content leadership roles at a Fortune Global 500 omnichannel commerce technology company.
Amazon’s search system is the gateway to product discovery. For buyers, it determines which products appear when they search. For sellers, understanding how Amazon ranks products is critical for visibility and sales.
Amazon’s original “Advanced Search” feature has been largely deprecated - only the Books category still has a dedicated advanced search page. For all other categories, Amazon now uses sidebar filters on search results pages. Behind the scenes, the search algorithm has evolved dramatically with AI-powered intent understanding and conversational shopping.
Table of Contents
- How Amazon Search Works for Buyers
- Search Filters (Replacing Advanced Search)
- Books Advanced Search (Still Available)
- Amazon’s Search Algorithm for Sellers
- AI-Powered Search: COSMO and Rufus
- How to Rank Higher in Search Results
- FAQs
How Amazon Search Works for Buyers
To find products on Amazon, buyers type a keyword or phrase into the search bar and optionally select a specific department. Amazon returns results ranked by relevance, which considers keyword matching, sales performance, customer satisfaction, and other factors.
Search results can be refined using: - Category/department selection from the dropdown before searching - Sidebar filters on the results page (see next section) - Sort options - Featured, Price Low to High, Price High to Low, Average Customer Review, Newest Arrivals
Note: Amazon search operators like quotation marks for exact matching and minus signs for exclusions no longer function. All filtering must be done through the sidebar and sort options.
Search Filters (Replacing Advanced Search)
For most product categories, Amazon’s search results pages include a left sidebar with filtering options. These have replaced the older Advanced Search pages.
Available Filters
| Filter | Description |
|---|---|
| Department/Category | Narrow results by product type |
| Brand | Filter by specific brands |
| Price Range | Set minimum and maximum price |
| Customer Rating | Minimum star rating (1-4+) |
| Prime | Show only Prime-eligible products |
| Delivery Day | Get It Today, Get It Tomorrow, specific date |
| Condition | New, Used, Renewed, Collectible |
| Seller | Amazon.com vs. third-party sellers |
| Deals | Active deals, Today’s Deals |
| Climate Pledge Friendly | Products with sustainability certifications |
| Category-specific filters | Size, color, material, and other attributes (vary by category) |
On mobile, filters appear through a “Filter” button rather than a sidebar. The same filtering options are available.
Books Advanced Search (Still Available)
The Books category retains a dedicated Advanced Search page. It allows filtering by:
- Title
- Author
- ISBN
- Publisher
- Language
- Format (hardcover, paperback, Kindle, audiobook)
- Publication date
This is the only category with a standalone Advanced Search page. All other categories use the sidebar filter system described above.
Amazon’s Search Algorithm for Sellers
Amazon’s search algorithm determines which products appear in results and in what order. Understanding it is essential for sellers who want their products to be found.
Algorithm Evolution
Amazon’s search system has progressed through several stages:
A9 (Foundation): - Keyword matching against titles, bullet points, descriptions, and backend search terms - Sales history and velocity - Conversion rates - Stock levels and availability
A10 (Current Evolution):
The community refers to the evolved A9 system as “A10,” though Amazon has never officially used this name. Key changes:
- External traffic is now heavily rewarded - traffic from Google, social media, and influencer partnerships signals genuine demand
- Conversion rate is weighted more than raw sales volume
- Seller authority matters more - feedback ratings, response times, order defect rates, and account health all influence ranking
- Customer satisfaction metrics including return rates and shipping speed affect visibility
- Click-through rate on search results impacts ranking for subsequent queries
Ranking Factor Comparison
| Factor | Previous (A9) | Current (A10 + AI) |
|---|---|---|
| Keywords | Exact keyword matching | Semantic and intent-based understanding |
| Sales | Volume-focused | Conversion rate-focused |
| Traffic | Internal Amazon only | External traffic heavily rewarded |
| Content | Keyword-stuffed content worked | Natural, benefit-first content preferred |
| Images | Alt-text stuffing for SEO | AI visual recognition (Amazon Rekognition) |
AI-Powered Search: COSMO and Rufus
Amazon’s search experience is being transformed by two AI systems that fundamentally change how products are discovered.
COSMO (AI Intent Model)
COSMO is Amazon’s AI model that uses large language models to understand buyer intent rather than just matching literal keywords:
- Interprets natural language queries semantically
- Reduces the effectiveness of keyword stuffing
- Rewards natural, descriptive, benefit-oriented content
- Adjusts rankings in real time based on shopper interactions
For sellers, this means writing product descriptions that clearly communicate what the product does and who it’s for, rather than stuffing keywords.
Rufus (Conversational AI Shopping Assistant)
Rufus is Amazon’s conversational AI shopping assistant, launched in 2024 and deeply integrated by 2026:
- Customers ask natural language questions like “best running shoes for narrow feet?”
- Rufus analyzes product listings, reviews, Q&A sections, and external web content to recommend products
- Products with clear, descriptive, benefit-oriented content are more likely to be recommended
- Rufus influences product discovery beyond traditional search - it creates a new discovery channel
What This Means for Sellers
AI-powered search favors: - Clear, natural language in titles and descriptions - Comprehensive product information that answers common questions - Strong reviews and Q&A sections (Rufus reads these) - Benefit-focused content over keyword-heavy listings
How to Rank Higher in Search Results
Based on the current algorithm, here are the most impactful factors for search visibility:
1. Drive Quality External Traffic
External traffic has become one of the most important ranking factors. Sources that convert (Google organic, email marketing, social media, influencer partnerships) signal genuine demand to Amazon’s algorithm.
2. Optimize for Conversion Rate
Conversion rate now matters more than raw sales volume. This means: - High-quality images (6+ per listing) - Compelling bullet points focused on benefits - A+ Content for Brand Registry sellers - Competitive pricing - Strong reviews and ratings
3. Maintain Seller Authority
Your overall seller health influences search ranking: - Keep your performance rating high - Respond to customer inquiries within 24 hours - Minimize order defect rate, late shipments, and cancellations - Use FBA or maintain excellent FBM metrics
4. Write for AI, Not Just Keywords
With COSMO and Rufus, natural language matters: - Write product titles and descriptions that clearly explain what the product is and who it’s for - Answer common customer questions in your bullet points and description - Fill out all product attribute fields to give AI systems more data points - Avoid keyword stuffing - it’s less effective and can hurt readability
5. Keep Inventory in Stock
Out-of-stock products lose search ranking immediately. Consistent availability is a prerequisite for sustained visibility.
FAQs
Does Amazon still have Advanced Search?
Only for Books. All other categories use sidebar filters on search results pages. The dedicated Advanced Search pages for other categories have been removed.
Do search operators (quotation marks, minus signs) work on Amazon?
No. Amazon search operators no longer function. All filtering must be done through the sidebar filter system or category selection.
What is the Amazon A10 algorithm?
“A10” is a community term for the evolved A9 search algorithm. Amazon has never officially used this name. The key differences from the original A9 are greater weight on external traffic, conversion rates, seller authority, and AI-powered semantic understanding.
How does Rufus affect product discovery?
Rufus is Amazon’s conversational AI that recommends products based on natural language questions. It reads your listings, reviews, and Q&As to determine relevance. Products with clear, descriptive content that answers common questions are more likely to be recommended.
How important are backend search terms?
Backend search terms still matter for discoverability. Use them for relevant keywords, synonyms, and alternate spellings that don’t appear in your visible listing content. Avoid repeating words already in your title or bullets.
Summary
Amazon search has evolved far beyond its original Advanced Search feature:
- Advanced Search only exists for Books - all other categories use sidebar filters
- Amazon’s algorithm has shifted from keyword matching to AI-powered intent understanding
- External traffic is now one of the most important ranking factors
- Conversion rate matters more than raw sales volume
- COSMO and Rufus use AI to understand what buyers want, favoring natural, descriptive content over keyword stuffing
- Seller authority (account health, metrics, reviews) directly influences search visibility
Win More Amazon Search Visibility