The document discusses HTML (Hypertext Markup Language). It defines hypertext as text that contains links to other texts. HTML is the language used to create webpages and uses tags to define page layout and elements. Common HTML tags include <html>, <head>, <body>, <h1> for headings, and <p> for paragraphs. Lists in HTML can be ordered or unordered. Unordered lists use the <ul> tag and list items are marked with bullets that can be customized with CSS styles. Ordered lists use numbers by default.