This tutorial is about creating an HTML document using Notepad in Windows. HTML is the language used on the internet for structuring and creating website content. The basic structure of an HTML file consists of tags, such as the opening and closing HTML tag, the head section, and the body section. In the head section, the title tag is used to display text in the web browser's title bar. By saving the file as an HTML file and opening it in a web browser, a blank page with "Hello World" in the title bar is displayed.