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Source:http://en.wikipedia.org/wiki/Computer_science

Its subfields can be divided into a variety of theoretical and practical
disciplines. Some fields, such as computational complexity theory (which
explores the fundamental properties of Computational and intractable problems),
are highly abstract, while fields such as computer graphics emphasize real-world
visual applications. Still other fields focus on the challenges in implementing
computation. For example, programming language theory considers various
approaches to the description of computation, whilst the study of computer
programming itself investigates various aspects of the use of programming
language and complex systems. Human-computer interaction considers the
challenges in making computers and computations useful, usable, and universally
accessible to humans.