A computer is an electronic device that can store, retrieve, and manipulate data. It has basic components like an input unit, output unit, CPU, memory, and control unit. Common input devices include keyboards, mice, and scanners, while output devices include monitors, printers, and plotters. The CPU contains a microprocessor, memory, and expansion slots to perform computations and transfer data and signals. Memory is used to store data, instructions, and results.

1. INTRODUCTION TO COMPUTERS

4. The Basic Components INPUT UNIT OUTPUT UNIT CPU ALU CONTROL UNIT MEMORY SYSTEM UNIT

7. Inside the CPU PROCESSO R MEMORY EXPANSION SLOTS

12. Built-in programs The programs written in the ROM at the time of mother board manufacturing