SEO
Crawling
Crawling is the process where search engine bots systematically browse the internet, following links to discover and download web page content.
also called: crawler, crawlers, crawled
// definition
To find and collect content across millions of unmapped web pages, search engines use crawling, an automated process where software programs systematically request files and follow embedded links across web servers. These automated programs, called crawlers, spiders, or bots, fetch raw Hypertext Markup Language code from web servers.
By extracting hyperlinks contained within retrieved pages, crawlers continuously discover new destinations. Following these links across interconnected sites enables software to map the visible structure of the public internet. During routine operations, such as when an online bookstore publishes a new novel page, bots fetch the file and queue extracted links for future automated visits.
// Crawling vs. Indexing
Crawling strictly fetches and downloads files from web servers, whereas indexing analyzes and stores that retrieved content in a searchable database. For example, a search bot might crawl a municipal utility's account portal by discovering its web address, requesting the server file, and downloading the underlying code.
However, crawling this portal does not mean the page will be indexed. If the utility portal requires user logins or duplicate page parameters, the search engine may crawl the file but decline to analyze or store it. Crawling retrieves raw page data, but only indexing makes that page visible in search results.
// why it matters
A business cannot appear in search results if search engine bots cannot access its website. Server errors, slow loading speeds, and restrictive instructions in robots.txt files block crawlers from downloading pages.
When search bots cannot fetch web pages, new products, services, and content updates remain hidden from potential customers. Efficient internal linking helps crawlers maximize their allocated crawl budget. Proper structure prevents bots from wasting energy on broken links or duplicate pages, ensuring priority content gets discovered promptly.
Questions and Answers
- How does a search engine discover new pages on a website?
- Search engine bots discover new pages by following hyperlinks from previously crawled pages. When a site publishes new content and links to it internally, crawlers detect the web address, send a request to the host web server, and download the new page file for future processing.
- Does crawling a web page guarantee it will show up in search results?
- No, crawling a web page does not guarantee search engine visibility. Crawling only fetches and downloads the raw page data from the web server. The search engine must subsequently evaluate, analyze, and index the content before that page can ever appear in search results.