How Search Engines Crawl Websites
Crawling is the process search engines use to discover and access URLs on the web. Search engine crawlers follow links, process sitemaps and revisit known URLs to discover new or updated content.
If search engines cannot access an important page, that page may have difficulty being discovered, crawled and eventually indexed. Technical SEO therefore starts with making sure important content is accessible to search engine crawlers.
Crawling vs. Indexing
The Basic Search Process
Discover
The URL is discovered through links, sitemaps or other signals.
Crawl
A crawler requests and accesses the page.
Render
Required resources may be processed to understand the page.
Understand
The content and page signals are analyzed.
Index
The page may be stored in the search engine's index.
What Helps Search Engines Discover Your Pages?
| Signal | Purpose |
|---|---|
| Internal links | Connect related pages and help crawlers discover URLs. |
| XML sitemap | Provides a list of important URLs that search engines can discover. |
| External links | Can provide additional discovery paths to your website. |
| Canonical tags | Help communicate the preferred version of similar or duplicate URLs. |
| Robots.txt | Provides crawler access instructions for specified URL patterns. |
Common Crawling Problems
Blocked Important Pages
Important URLs may be unintentionally restricted by robots.txt or other access controls.
Broken Internal Links
Links pointing to missing or incorrect URLs can create poor discovery paths.
Orphan Pages
Pages with no meaningful internal links may be harder for crawlers to discover.
Redirect Chains
Multiple redirects between the original and destination URL create unnecessary complexity.
Excessive URL Variations
Large numbers of parameterized or duplicate URLs can make crawling less efficient.
Slow Server Responses
Slow responses can make crawling and user access less efficient.
SEOHACK Tip
Related Technical SEO Guides
Continue learning with these related Technical SEO resources.
Site Architecture
Build a logical website structure that supports SEO and users.
Read Guide →SEO URL Structure
Create clean, logical and search-friendly URLs.
Read Guide →Robots.txt
Control crawler access and avoid common robots.txt mistakes.
Read Guide →XML Sitemaps
Help search engines discover and understand your important URLs.
Read Guide →Ready to Improve Your
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