(SMS) Short Message Service

Short Message Service (SMS) is a technology that enables the sending of text messages of up to 160 characters from one mobile phone to another. It was first introduced in the 1990s and has since become a widespread and widely used feature of mobile phone services. SMS is often used for personal communication, but it is also used by businesses for a variety of purposes, such as for marketing campaigns, customer service, and appointment reminders. In addition to traditional SMS, there are also various forms of multimedia messaging, such as MMS (Multimedia Messaging Service), which allows for the sending of multimedia content, such as images and videos, in addition to text.

https://en.wikipedia.org/wiki/SMS