Opt-out is a process by which individuals can choose not to receive unsolicited information or services. Opt-outs are important because they give individuals control over their personal information and privacy, and they help to reduce the amount of spam and junk mail that people receive. Contacts have the option to unsubscribe from receiving messages by utilizing a link provided on the landing page or directly within the SMS. Upon opting out, the respective mobile number is registered in the 'Opt-out' list. This results in the restriction of sending SMS to that number from the account in question, encompassing the entire account rather than being restricted to a specific user.