Verification is checking to make sure that data has been entered correctly.

Verification is often carried out by getting two users to enter the same set of data at different computers.

Once both users have entered the data the two sets of data are compared to check that they match up.

Any data that does not match up is rejected.

Verification can also be carried out by software which might, for example, ask for the same data to be entered twice.

If both entries don't match up the data is rejected.