It’s a sample site. The page is different from the entry in so far as the page is a permanent entry, which, at most templates, is permanently located in the navigation section of the website. Most people start with an introduction page that presents them or their activities to visitors on the website. The introduction page could be something like:

Welcome to the Readers. I’m a biker pizza guy by day, and I’m an aspiring actor at night, and this is my website.
I live in Budapest and have a wonderful German shepherd dog who listens to the name Velorex. My favorite cocktail is Piña Colada, but I also like Mojit very much. (But the real juice is a velvet red wine.)

… or something completely different:

XYZ Bigyó Vállalat was founded in 1971 and has since manufactured the highest-quality widgets. The company’s headquarters are located in Budapest, where they employ more than 2,000 people, and they also actively participate in numerous community and charitable programs.

As a new WordPress user, Control panel You can jump in and delete this page and create a new page for your content. Have fun.