A computer system is a combination of hardware and software that works together to perform tasks. The hardware includes physical components like the CPU, memory, hard drive, and input/output devices such as keyboards and monitors. The software consists of programs and operating systems that instruct the hardware on how to operate and process data. Computer systems can be classified into various types, including personal computers, servers, and embedded systems. Each type serves different purposes, from everyday tasks like browsing the internet to managing complex databases. Overall, computer systems are essential tools in modern society, enabling communication, productivity, and entertainment.