A more thorough explanation:

Coded communications refer to messages that have been encoded or enciphered using a method of transposition or substitution. This process makes the messages unintelligible to anyone who does not have the key to the code or cipher.

For example, during World War II, the Germans used the Enigma machine to encode their messages. The Enigma machine used a series of rotors to scramble the letters of the message, making it impossible for anyone without the correct settings to decipher the message.

Another example of coded communications is the use of passwords. When you create an account on a website, you are often asked to create a password. This password is a form of code that only you know. When you enter your password, the website uses it to decipher your account information and grant you access.

In both of these examples, the messages are encoded in a way that makes them unreadable to anyone who does not have the key to the code or cipher. This is the essence of coded communications.