SEO basics: What is crawlability?

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Do you want to outrank your competition? Then basic knowledge of technical SEO is a must. Of course, you also need to create great and relevant content for your site. Luckily, the Yoast SEO plugin takes care of (almost) everything on your WordPress site. Still, it's good to understand one of the most important concepts of technical SEO: crawlability.
What is the crawler again?

A search engine like Google consists of three things: a crawler, an index, and an algorithm. A crawler follows the links on the web. It does this 24/7! Once a crawler comes to a website, it saves the HTML version in a gigantic database called the index. This index is updated every time the crawler comes around your website, and finds a new or revised version of it. Depending on how important Google deems your site and the number of changes you make on your website, the crawler comes around more or less often.
Fun fact: A crawler is also called a robot, a bot, or a spider! And Google's crawler is sometimes referred to as Googlebot.