← DictionaryOpt-In
also called subscribe, sign-up
A person's explicit agreement to receive communication.
They said yes to hearing from you.
What It Is
Opt-In belongs to Marketing, specifically the Channels part of it. The working definition is simple: a person's explicit agreement to receive communication.
It is a label with a settled working definition, so the value is in using it the same way every time. Used with that meaning, it stays a working tool rather than a talking point.
How It's Used
Opt-In comes up in campaign planning, channel choices and the reporting that follows them. It rarely travels alone — expect it next to Email List, Lead Magnet and Double Opt-In. The practical test is whether everyone in the room means the same thing by it.
Why It Matters
Getting Opt-In wrong is expensive in a quiet way. When it is unclear, spend keeps moving but nobody can say what it bought. 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. They said yes to hearing from you.
Termshift™
How the meaning shifts depending on who is using it, and where.
In agency and in-house rooms, Opt-In means exactly a person's explicit agreement to receive communication.
In plain conversation it comes out as they said yes to hearing from you.
The Bottom Line
The practical takeaway on Opt-In: they said yes to hearing from you. Judge it by that, not by how it sounds.