What is opt-in?
Opt-in refers to a user actively giving their consent, for example, to use cookies. This would mean that a user has explicitly agreed to allow a website to store cookies on their device. The opt-in mechanism for cookies is often implemented through a cookie popup or banner that appears on the website, which the user can use to opt in for cookies. This is a way for users to have more control over how their data is collected and used by websites.