Introduction:
A computer is an electronic machine that is designed to perform various tasks by executing a sequence of instructions. It is a complex device that has revolutionized the way we live and work. Computers are widely used in various fields such as education, business, entertainment, and research.

Explanation:
1. Electronic:
- Computers are electronic machines because they operate using electronic circuits and components.
- Electronic circuits are made up of various electronic components such as transistors, diodes, resistors, capacitors, and integrated circuits.
- These components enable the computer to process and store data, perform calculations, and execute instructions.

2. Components of a Computer:
- A computer consists of various hardware components such as the motherboard, central processing unit (CPU), memory, storage devices, input devices, and output devices.
- The motherboard is the main circuit board that connects and allows communication between all the components of a computer.
- The CPU is the brain of the computer and is responsible for executing instructions and performing calculations.
- Memory stores data and instructions that are currently being used by the CPU.
- Storage devices such as hard drives and solid-state drives are used to store data and programs for long-term use.
- Input devices such as keyboards and mice are used to provide input to the computer.
- Output devices such as monitors and printers are used to display or produce the results of the computer's operations.

3. Working of a Computer:
- When a computer is powered on, electricity flows through the electronic circuits of the computer.
- The CPU fetches instructions from the memory and executes them one by one.
- These instructions are in the form of binary code, which consists of combinations of zeros and ones.
- The computer uses a binary system because electronic circuits can represent only two states: on or off, represented by 0 and 1, respectively.
- The CPU performs calculations, manipulates data, and communicates with other components of the computer to carry out the desired tasks.
- The results are then displayed on the monitor or stored on storage devices for later use.

Conclusion:
In conclusion, a computer is an electronic machine that operates using electronic circuits and components. It can perform various tasks by executing instructions and manipulating data. Computers have become an integral part of our lives and have revolutionized the way we work, communicate, and access information.