Input refers to data that is entered into a system, while Output refers to the result or information generated by a system as a response to the input. Full definition
The key responsibilities of an IT programmer include evaluation of input and output data, conversion of work flow into computer language, conducts tests for sequences and codes, protects operational confidentiality etc.. (resumetemplate.org)
You are responsible for taking sufficient precautions and checks to satisfy your own particular requirements for accuracy of data input and output. (theparkhotels.com)
In each of these cases, the revolution happened because the gap between input and output got smaller. (theverge.com)