Definition - What does Data Integrity mean?
Data integrity, in the context of networking, refers to the overall completeness, accuracy and consistency of data. Data integrity must be imposed when sending data through a network. This can be achieved by using error checking and correction protocols.
Techopedia explains Data Integrity
It's pretty simple -- if the data received isn't the same as the data sent, you've got a problem! Much of networking involves working to improve data integrity.