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opt in
This term is primarily used in administrative, legal, and digital contexts to describe a system where participation is not automatic. It carries a connotation of agency and explicit consent, contrasting with "opt out" systems where a person is included by default unless they take action to leave.
In modern data privacy and marketing, "opt in" is a technical requirement for compliance with laws like GDPR, where a user must proactively check a box or sign a form to allow data collection. Using this term in a casual social setting may sound overly formal or bureaucratic.