Validation
Is it valid or allowed, can check if something is valid but sometime inacurrate
You can check if it is not correct.
This ensure data is correctly inputted and spots human errors.
Ensures data entered complies with allowable data
many different types of validation include:

Range checks
format check
type character checks presence checks
Length checks
Lookup existence.



Vertification
Is it the same?

Hesitance check
It is a number that is derived from the other contents of the number

Backing up and archivivng
full compies every file fully]
Incremental Backup
Only copies files that are changed in the last backup

Archiing
not the same as backup

storing old/unused data

Taking it from server mainframe

Transferring onto storage medium

Unlikely to be used again but still available.