A2P refers to the process of sending mobile messages from a business application to a mobile user, typically through an automated process, for marketing or service purposes.
A2P, also known as business SMS or enterprise SMS, allows businesses to automate the sending of large volumes of messages in order to facilitate business critical messages such as two-factor authentication, emergency alerts, and appointment reminders – as well as more promotional and sales-type messaging.
Messages in A2P are frequently sent from a short code to benefit from the scalability and efficiency that this provides.