HTML5 (HyperText Markup Language 5) is a markup language that specifies the structure and content of documents displayed in web browsers (covering tables, forms, internal linking, and meta elements).

• You create HTML5 documents by typing markup in a text editor (Notepad, TextEdit, vi, emacs) and saving with the .html or .htm extension.
• Computers called web servers store HTML5 documents; clients (browsers) request them.