Search engines like Google use sophisticated bots (computer programs) to visit websites across the internet.
These bots look for changes on your WordPress website and compare them to the main search index.
If they discover new content, they add it to the search index. If they find content already in the index but has changed, they update the index with fresh content.
Search bots then follow all the links on a page and then repeat the process for those pages.
The way bots move from one link to other links on a page is similar to how real spiders crawl along their webs.
That’s why the term crawling is used to describe this activity, and you may sometimes see the bots referred to as search engine spiders.
For better SEO, you need to ensure that search engines can crawl your website easily.