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Is the study of the theoretical foundations of information and computation, and of practical techniques for their implementation and application in computer systems.Computer science has many sub-fields; some, such as computer graphics, emphasize the computation of specific results, while others, such as computational complexity theory, study the properties of computational problems. Still others focus on the challenges in implementing computations. For example, programming language theory studies approaches to describing computations, while computer programming applies specific programming languages to solve specific computational problems, and human-computer interaction, focuses on the challenges in making computers and computations useful, usable and universally accessible to people.