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Video can be very useful. Most banks and stores  have video cameras. They protect the premises. When there  is a robbery, the police can study the video. They can often identify the robbers in this way

Videos are very useful in education. Many schools use them as teaching aid. You can take university courses at home with the help of a VCR (video cassette recorder). In the future, they will be even more important in education.

Videos are very important in the music industry. You can now  buy VCDs (video compact discs) in many countries worldwide. They play music and show video images at the same time.