How can ASCII be used to represent characters in a computer system?

ASCII character plays major Role in computer. With ASCII computer cannot any do single performance.

Explanation:

For example: - If end user enter data "A" in keyboard system converted to 65 as ASCII value and converted to hexadecimal as 41 as stored in keyboard buffer and sent signal to CPU.

Once CPU received signal and it will convert 65 into bits and stored in ram and send signal to monitor and display "A" character in monitor. It uses octal decimal.

Without ASCII computer can't any operation in system.