Opt-In is a process where individuals actively give permissions to receive communications, typically by signing up or subscribing. Opt-Out is a process that allows individuals to withdraw their consent to receive further communications. For text messaging, this usually involves replying with a keyword like “STOP” to unsubscribe from future messages. Providing an easy opt-out message is required through the Telephone Consumer Protection Act (TCPA). Expressing Written Consent is an explicit permission from an individual, given in writing, to receive communications, particularly marketing or promotional messages. For text messaging, written consent is required to send automated or promotional texts, and it must be clear that individuals agree to receive messages from a specific sender. Transactional text messages are sent to facilitate an agreed-upon transaction or provide information related to it. However, promotional messages are used to market products, services, or events. Understanding these terms is crucial for compliance with marketing regulations and for maintaining positive customer relationships.