Video-file is a multimedia file, which consist live-picture and sound. Video-file is possible to make by handling electronic signals.
Video–files is mainly used in television by entertainment purposes, but it also widely been used in many different industry fields. One minute of video tells much more than hundreds of pages of text. Video–file is very useful and efficient tool for information sharing and recording and that's why it is also very popular way of teaching.
Because of very fast technology development, quality of video files has improved a lot in last 20 years. First huge step was move from black and white –videos in to full color –videos. First idea to produce live-picture, video-files, was to send rays in to cathody ray tube, what catch signals and transalate it in to real picture. Now days there is also few other and more common ways to produce live-picture. Digital-age has bring plasma display, video projectors and HDMI- televisions.
In industry and educational use video will be produced more often by computers,which can now display television and film-style video clips and streaming media, encouraged by increased processor speed, storage capacity and broadband access to the Internet.
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