What is the difference between ICT and IT?

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Information Communication Technology (ICT) and Information Technology (IT)

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Is computer science and/or software engeneering a subset of IT/ICT?

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Not only Computer Science and Software engineering, there are many disciplines which fall under category IT/ICT. Disciplines that involve computers in processing, transmitting, storing or manipulating data/information often categorically fall under IT/ICT.
For example,

>Data Structures
>Telecommunications Engineering
>Discrete Structures and Graph Theory
>Computer Based Numerical and Statistical Techniques
>Digital Logic and Design
>Soft Computing
>Multimedia and Animation
>Operating Systems
>Theory of Automaton and Formal Languages
>Information Theory and Coding
>Cyber Security
>Web tech
>Computer Engineering
>Design and Analysis of Algorithms
>Database Management Systems
>Principles of Programming Languages
>Management of Information Systems
>Computer Networks
>Software Engineering
>Compiler Design
>Artificial Intelligence
>Distributed Systems
>Cryptography and Network Security
>Information Systems