What is SMS (short message service)?

i need to attach the articles that the literature review should be based on it
then i have the topics that i need from the articles here is it
-Overview
This part will explain the application of communications for the system and hardware device that measures the weight of an item which is virtually transmitted through SMS communication system from another location.
-What is SMS (short message service)?
Here the SMS system will be explained theoretically and technically in order to give the reader a better understanding of the system and its link to the project.
-System Development
This part presents the basic system architecture and all the necessary steps for the development of the main system, which constitute the programming framework for the SMS system.
-Design & Implementation The design and implementation part will focus on the technical details of communication through SMS system with respect to this project. The explanation shall include the following:
System and Software Design
Sending and receiving data
Applying the SMS tool in the measurement process
-SMS Security Issues
The relative security issues for SMS system will be considered in this part with respect to the project needs.
-Sum-up