Computer science is the science which deals with the study of information and computation in a computer system. Researchers and scientist in the field of computer invented algorithmic process which is used to create, describe and transform the information and tends to formulate abstraction into model complex systems. As there is a vast growth in science and technology all fields are evolving with the help of computers. All kind of complex substances is made simpler by using the computer. Computer science is divided into many fields computational complexity theory, programming language theory, computer programming and human-computer interaction. The study of computational problems such as computer graphics emphasizes computation of specific results known computational complexity theory. The programming language theory involves in study of computer programming language for performing a task or operation. The human-computer interaction focuses on the making use of computers and computation which are globally accessible to all humans. Computer science also deals with understanding the properties of programs which are used to implement or create software’s such as web browsers, games and so on. They are also used for creating new programs and also to improve existing ones. Thus, computer science makes its role perfect in satisfying all kinds of users.