HTML is a markup language that allows you to create webpages. HTML stands for hyper text markup language. Hyper text acts when you click on videos or images.
Markup language tells computers how to format documents.
If you think of a website as a collections of images and texts, html's job is to organise them, like how you format a news paper or a poster. So basically what html does is to put each pieces of the website on its right place.
But it is not just html, it is html, Css and several other languages.
