HTML itself can be loosely considered much like a word document. When a user writes a paragraph of text and saves it, the word processor (like Microsoft Word) saves not only the words, but information such as what font type and size was used. HTML does the same for websites, providing a clear schematic of words, formatting types and links to be recreated on the website. HTML together with CSS (Cascading Style Sheets) work to develop the text and data of a website.
These programming languages often share many common features, commands and rules, allowing those with an understanding of one language to easily switch to another. One of the most popular is PHP. Developers gravitate to this language because of its open source nature and compatibility with multiple operating systems.
The Internet is more than a communications tool; programming languages and software like PHP make designing effective and functioning websites far easier than ever before.