Final answer:
A replacement cipher, also known as a substitution cipher, is a code where each letter in the encrypted text is substituted with a fixed letter based on a predetermined shift in the alphabet. It is commonly used in cryptography to protect sensitive information.
Step-by-step explanation:
A replacement cipher, also known as a substitution cipher, is a type of code where each letter in the encrypted text is substituted with a fixed letter, based on a predetermined shift in the alphabet
For example, if the shift is 4, then the letter 'A' would be replaced with 'E' and so on. This type of cipher is used to encode messages and protect sensitive information. It is commonly used in the field of cryptography and can be seen in historical examples like the Zimmerman Telegram during World War I.