How do you explain about computer?

Computer of all sizes have common characteristics - speed, arithmetical and logical operations, accuracy, reliability, storage, retrieving data and programs, automation, versatility, communications, diligence , feelings ,travel and leisure life today. Computers are the foundation of business, travel , and leisure life today. Computer provide the processing speed required by all facets of society. The quick service we expect at the bank, at the grocery store, on the stock exchange, and on the stock exchange ,and on the internet are dependent on the speed of computer.