A computer is an electronic device that processes raw data according to programmed instructions to generate information and solve problems. It accepts input, processes and stores data, and produces output. Computers allow for global communication, easy information lookup, data backups, and work from home. They can store large amounts of data accurately and perform repetitive tasks. However, overuse can lead to isolation and data loss can occur from viruses. Computers are also expensive, require frequent maintenance, and some lack knowledge on how to use them.