Activation is the point where a new user first gets real value from a product, such as sending their first invoice or publishing their first page. Activation rate is the share of signups who reach it.
Each product defines its own activation event: the action most linked to users sticking around.
Shortening the path to that moment, with fewer steps and good defaults, is usually the biggest lever on early retention.
Why it matters for a launch
Launch days bring many signups. Activation decides how many become users rather than accounts that never come back.