What is the origin and context of use of 'roger'?

The use of "roger" as an interjection has its origin in radio communication and military jargon where it is used to acknowledge that a message has been received and understood. In more casual and everyday language, the use of "roger" has extended beyond its original radio communication context. It is sometimes used informally as a way of expressing agreement or acknowledgment in a similar manner to saying "got it" or "acknowledged."