Computer System-An Overview
A computer is an electronic device that stores, retrieves and processes data. It can be programmed with instructions. A computer is composed of hardware and software, which transforms some data into information. Hardware represents physical and tangible components of computer. Software is a set of programs that govern operation of computer system and make hardware run. Peripherals are hardware devices that surround the system unit.
A computer follows the I-P-O cycle, i.e., it needs certain input, carries out a process and produces output. Computer is used in each and every aspect of human life. They are used for commercial purposes as well as for personal use.
Strengths of Computers include Speed, Accuracy, Versatility, Reliability and high Storage Capacity. Weakness of Computers include Zero IQ and lack of decision making power. Computers can be classified into various categories. For example embedded computers, programmable computers, laptop computers etc. Personal Computers are used in business and home applications to perform various general tasks. Workstations have more memory and calculating capacity. They are used for scientific and industrial purposes where high calculating capabilities are required. Memory refers to the storage brain of computer, which holds the data during processing.
Mainframe computers are multi-processor systems. They are used to handle huge amount of data and information. Supercomputers are the most powerful digital computers.