A definition tells you what a word means. None of these do that. Each is a procedure you run against work you have paid for — what to ask for, in what order, and what the answer means when it does not arrive. They are written to be run without us and without a technical background; a check that needs you to hire somebody has failed.
The checks are free and you can run them yourself. What we sell is the version where the answer arrives with a plan attached, and where the awkward questions are asked by someone the supplier cannot wait out.