Opt-in meaning

To accept some situation or condition ahead of time. For example, to opt-in to an email campaign means that you agree to receive periodic newsletters or information, which may include advertising from the publisher or third parties. An opt-in program implies that you can cancel the service, or "opt-out." A lot of spam is sent out under the guise that, at one point, the user did opt-in for the program, which may or may not be true. See spam and bacn.
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Of a selection, the property of having to choose explicitly to join or permit something; a decision having the default option being exclusion or avoidance; used particularly with regard to mailing lists and advertisement.

They set up an opt-in mailing list, so that those who wanted the notices could subscribe.

adjective
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To choose to participate in something.
verb
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Origin of opt-in

  • From opt + in.

    From Wiktionary

  • opt + in

    From Wiktionary