ICT deals with computer and it processes and functions whilst ICTS deals with the with the peripherals used in computing

ICT stands for Information and Communication Technology, which is a broad term covering all technologies used to handle telecommunications, broadcast media, intelligent building management systems, audiovisual processing and transmission systems, and network-based control and monitoring functions. On the other hand, ICTs refer to specific information and communication technologies like computers, smartphones, the internet, and other digital devices. So basically, ICT is the big umbrella term, while ICTs are the individual tools under that umbrella.

ICT is the use of computer to process data into information and sharing the information between two or more users while ICTS consist of information technology, communication technology and other technologies such as AI,web technology, broadcasting technology etc.