The simple explanation of the difference between Computer Science and Computer Applications is the figuratively the difference between knowledge and wisdom.
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Computer Science is the study of the preliminary concepts involved in the working of a computer. Computer Applications is the study of the application of computer software in the corporate world.
Computer Science teaches you how computers work and Computer Applications teaches you how get things done using a computer.
Computer Science helps you understand why a computer works the way it works and how to get the best output from it.
The study of this science involves understanding the complete structure of a computer, from machine level to user level - working of a processor, working of a memory, working of loops, working of pipelines etc etc. This helps you understand what sort of algorithm is required to perform a certain tasks and which hardware blocks you need to use to get the best performance.
Computer Application, on other hand, is as is designing/writing/using programs to get the computer working. This involves learning of various languages, techniques, structures etc. An example will be designing and implementing a program to store the entire bus network activity of a metropolitan city in a database on a server where a statistical process keeps running in the background to identify the best and the worst transit options between two places.
If you want to have such a program you would require the knowledge of how database servers work.
So, if you want to study computer science then go with BTech / BSc in CSE/IT
and if you want to study computer applications then go for BCA / MCA
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