When bits are transmitted over the computer network, they are subject to corruption due to interference and network problems. The corrupted bits lead to spurious data being received by the receiver and are called errors.

Error detection techniques are responsible for checking whether any error has occurred or not in the frame that has been transmitted via network. 

When the sender transmits data to the receiver, the data might get scrambled by noise or data might get corrupted during the transmission.

Some popular techniques for error detection are: 

1. Simple Parity check 

2. Two-dimensional Parity check 

3. Checksum 

4. Cyclic redundancy check