Terms of Service
also called terms and conditions, T&Cs
The published rules governing use of a site or service.
The rules for using your site or service.
What It Is
Terms of Service is part of Technology, and more precisely Compliance. In practice it means this: the published rules governing use of a site or service.
It is a label with a settled working definition, so the value is in using it the same way every time. Held that way, the term stays useful instead of turning into decoration.
How It's Used
You will usually meet Terms of Service in build decisions, tooling and the plumbing behind a working system. It rarely travels alone — expect it next to Privacy Policy and Contract. The practical test is whether everyone in the room means the same thing by it.
Why It Matters
Terms of Service is cheap to get right early and awkward to fix late. When it is unclear, small technical debts compound into a rebuild. The businesses that treat it seriously spend less time redoing work.
It is a label people agree on so they stop describing the same thing five different ways. The rules for using your site or service.
Termshift™
How the meaning shifts depending on who is using it, and where.
In agency and in-house rooms, Terms of Service means exactly the published rules governing use of a site or service.
In plain conversation it comes out as the rules for using your site or service.
The Bottom Line
Terms of Service is not complicated — it is just often left vague. The rules for using your site or service. Decide it, write it down, move on.