Modern computers generally refer to general-purpose digital electronic computers, which are the mainstream in the electronic computer industry in the world today. What they process internally is an electrical signal called a symbolic signal or a digital signal; its main characteristics are " "Discrete", there cannot be a third symbol between two adjacent symbols.
Electronic computers are divided into analog electronic computers and digital electronic computers. Analog electronic computers came out earlier. The electrical signals used internally simulate actual signals in nature, so they are called analog electrical signals.
Analog electronic computers have poor accuracy in processing problems; all processing processes require analog circuits to realize, the circuit structure is complex, and the ability to resist external interference is extremely poor.
Digital electronic computers are the mainstream in the electronic computer industry in the world today. Their internal processing is an electrical signal called a symbolic signal or a digital signal. Its main feature is "discrete", and there cannot be a third symbol between two adjacent symbols. Due to this difference in signal processing, its composition and performance are superior to analog electronic computers.
Digital electronic computer, referred to as digital computer. The information transmitted, stored and calculated inside is all numbers expressed in the form of electromagnetic signals. A typical digital electronic computer consists of a central processing unit, a computer storage system, and a computer input/output system.
Computer storage system includes main memory and auxiliary memory. The central processing unit and main memory are collectively called the central processing unit; the computer input/output devices and auxiliary memory are collectively called computer peripherals. A computer cannot work even if it only has hardware. It must also have a set of "programs" to determine the rules and order of information processing. The same hardware paired with different programs can solve different types of problems. Computer programs and corresponding data and documents are collectively called computer software, which includes computer system software, computer application software and computer support software. The organic whole composed of computer hardware and software is called a computer system.
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