The Atbash Cipher is a simple substitution cipher that replaces each letter in the alphabet with its reverse counterpart. For example, 'A' becomes 'Z', 'B' becomes 'Y', and so on. This method is easy to implement and decode, making it a popular choice for basic encryption tasks. Originally used in ancient Hebrew texts, the Atbash Cipher is one of the oldest known ciphers. It is often used for educational purposes to introduce concepts of cryptography and can be applied to any alphabet, not just the Latin one.