Define what is meant by the term Signal. What methods are used to detect errors

Define what is meant by the term Signal. What methods are used to detect errors in correct them in signals? What is the role of signal encoding and decoding when it comes to signal transmission?
Your response should be 250-300 words (total answering all parts of the discussion question). Make sure you post your response by Thursday of the week and make sure you make two quality posts commenting on your classmates’ responses (and mine) before the end of the week.
Please cite your resources in APA format.