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 Everyday Examples
 Substitute:  To replace one element of a mathematical equation or expression with another.
In order to do simple cryptography, one can encrypt a message using a "substitution cipher" where each letter of the alphabet has a symbol or other letter substituted for it. You can use the same substitution to encrypt and decrypt the secret message.

For example, the following is part of a substitution cipher: a = H, b = M, c = Z, d = A, e = R, f = J,

If we wanted to send the secret message "fade," then we could send "JHAR." Then your secret partner can decipher the message using the same substitution cipher.