Multimedia, in fact, represents technologies and applications which integrate various kinds of media: text, sound, video, graphics and animations. The most important features of multimedia are hypertext, hypermedia and interactivity.
Hypertext means that you can click on a word or another object and jump to another screen containing more information.
Hypermedia is an extension to hypertext that supports linking graphics, sound, and video elements in addition to text elements.
Interactivity means involving the user in the program, he can choose what to watch, listen or write.
If we want to recognize, what the selected file contains, our first sight aims at the file extension. According to the extension we choose a specialized program to open it. Thanks to the extensions we can recognize a file format, too.
According to their formats, we divide files into the following groups:
Text files (.doc ; .txt ; .rtf ; .html ; .pdf ; …)
Graphic files (.jpeg ; .gif ; .tif ; .bmp ; …)
Audio files (.wav ; .mp3 ; .ra ; .aac ; …)
Video files (.avi ; .mpg ; .flv ; .mov)
Compressed files (.zip ; .rar, ; …)
System formats (.exe ; .bat ; .sys ; …)
© Střední průmyslová škola elektrotechniky a informatiky, Ostrava, příspěvková organizace