The latter is more efficient, but not all web browsers support client-side image maps. Most web editors have features that create client-side image maps. To use a server-side image map, your map file should then be saved and named with the extension .map . Note that images defined as image maps may be either GIF or JPEG images. Digitized sound files can be included within a web page for those who wish to add a personal greeting or include some original composition for others to hear.
Many modern systems come with built-in microphones that can be used to record sounds.