Encryption is the process of disguising information into an unreadable form.
People without the proper authentication are prevented from accessing that information. Decryption is the reverse of encryption. It makes unintelligible, or encrytped, information understandable. There is no better way to keep intruding hackers, nosy co-workers, pesky younger siblings, and cunning competitiors from your critical information. Companies spend significant resources to protect data on their networks.