This study investigated on the applications of computational methods in software and computer services. We know that mathematics, computer science and software development are related fields. Through reading of different books, consulting computer science students, web searches and personal knowledge on mathematical models and statistical methods, we were able to find these applications. These are simulation and optimization, Monte Carlo methods, software development and modeling, model fitting and data analysis and numerical analysis which are applied widely in the computing and informatics field. Ranging from software development to virtual graphics, video games, imaging and computer games. Thus mathematical models plays a key role in this field. Also some of these software are then used in various sectors of the economy to solve problems efficiently and improve the fast-moving world of technology.