Technically, Web graphics can be stored in any format, but only three formats display inline on all of today's popular graphical browsers: GIF, JPEG, and PNG.
A third format, PNG, is gaining ground; indeed, PNG is now the native graphics format within all the Microsoft Office applications. Other graphics formats must be displayed by a helper application, which is launched by the browser when it detects a format it can't display.
Microsoft Internet Explorer supports the inline display of Windows Bitmap (.BMP) graphics in addition to GIFs, JPEGs, and PiNs.
Scalable Vector Graphics
Scalable Vector Graphics (SVG) is an emerging, XML-based graphics format that will enable developers to describe two-dimensional graphics. ...