A breadcrumb is essentially a trail at the top of any given web page that shows a user where that particular page lives within the site structure. For instance, if someone is on a page about a nonprofit’s mission, the breadcrumb at the top might say Home / About / Mission and Vision. It’s an additional (but optional) way to let users understand where they’re at on your site.
Understanding the type of people who visit your site is a very important task because you can use that information to enhance your site to suit them.