What is meant by password Encryption

1) i am entering a password in the text filed how it will be changed when it is storing in data base.
2) why this Message Digest is Using.
3) what is meant by SHA
i am unable understand when i read this topics.
thanks,
Chilakala

1) i am entering a password in the text filed how it
will be changed when it is storing in data base.That's what you're supposed to know. You wrote the program.
2) why this Message Digest is Using.Because you don't want to store the password itself for security reasons, but something that can be created from the password, but that in turn cannot be used to reconstruct the password. A one-way conversion.
3) what is meant by SHA A hashing algorithm.

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