Opt-in/Opt-out systems

Opt-in and opt-out systems are methods for managing consent in data collection or participation. Opt-in requires individuals to actively agree or give permission before their information is collected or they are included in a service. Opt-out allows individuals to be automatically included but provides an option to decline or withdraw consent. For example, for email marketing, opt-in means you must sign up to receive emails, while opt-out means you receive emails by default but can choose to stop them. These systems help protect privacy and give control over personal information.