In simple words, a computer takes information, works on it, and gives you useful results.
Main functions of a computer:
- Input: Taking data (keyboard, mouse)
- Processing: Working on the data (CPU)
- Storage: Saving data (hard drive, SSD)
- Output: Showing results (monitor, printer)
Examples of computers:
- Desktop computer
- Laptop
- Smartphone
- Tablet
If you want, I can explain it in Bangla or give a short exam-ready definition.