Definition of “opt in” - English Dictionary

“opt in” in Business English

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opt in

phrasal verb with opt uk /ɒpt/ us verb [ I ]

to choose to be part of an activity, arrangement, etc.:

Company policy is to leave new workers out of the pension scheme, unless they choose to opt in.

opt-innoun [ C or U ]

uk us

the fact that you do not have, receive, or join in something unless you choose to, or something that you do not have or receive unless you choose it:

Users have to click to give the company permission to collect data about their online habits, a process called opt-in.
We have a company pensions policy where there is an opt-in instead of an opt-out.
opt-in feature/system/policy The social networking site has introduced an opt-in feature for customers.

(Definition of “opt in” from the Cambridge Business English Dictionary © Cambridge University Press)