The simplest type of text messaging is called SMS, or Short Messaging Service, and it is solely confined to text and 160 characters. It is basic, but is still preferred for many text marketing initiatives.
With MMS, or Multimedia Messaging Service, you can send your customers messages that contain not just text but also images, GIFS, videos, and audio files. MMS is a more robust messaging service than SMS. Compared to SMS communications, MMS messages frequently result in far greater client involvement.
RCS, or Rich Communication Services, which is even more advanced, allows for two-way communication with your customers in addition to using multimedia assets, much like a mobile app.