.html or .htm: These files, commonly referred to as web pages, are written in an easily learnable and programmable language: Hyper-Text Markup Language (HTML).

.asp: Active Server Pages, this file type resembles HTML in presentation, but functionally the two are dynamically different. ASP is a file type that contains HTML, scripting and calls to components. It runs and is compiled server side on Microsoft Web Servers.

.gif: A common graphic format which contains no more than 256 unique colors, therefore allowing a quicker load time than JPEG. One popular utilization of GIFs is for animation; another type, common on a variety of Web sites, is the interlaced GIF, which loads in layers of increasing detail.

.jpeg or .jpg: Another common graphic format, but instead of using 256 colors JPGs are capable of up to 16 million. You will find that this format is generally reserved for photographs and detailed artwork; and, as might be assumed, these images can take longer to load than the simpler GIF.

.midi or .mid: An older standard, MIDI (Musical Instrument Digital Interface) files contain sequences of digital numbers your computer uses to interpret simple musical notes. Also, much like the GIF they are quick to load.

.wav: As opposed to MIDI, WAV files can reproduce up to CD quality music through your computer’s speakers. They are also significantly larger than MIDI files.

There are many other file types processed by your browser, and the list continues to grow with the Internet.