The develop out of necessity, and they are developed for different applications. The computers that run jet fighter aircraft, government mainframes, and anti-missile systems aren't gonna be running on Windows XP. Also, they are developed to compete with each other, by different companies.

Many programming languages reflect specific needs. One language is not the best one for every problem - although just about anything could be shoehorned into a solution in any particular language. Going back to some of the original languages, and yes, I know I am dating myself, Basic and Pascal came about from a need to have easy-to learn, but not overly powerful languages. COBOL and its relations were best for business applications like accounting and reporting. ForTran and its relations were best for scientific programming. LISP and other logic-based languages were suited for AI and decision-making. People saw a need that wasn't being well filled by an existing language, and so created one to better fill the gap. [Ever try to do a scientific project in COBOL? You'll tear your hair out - when you finally finish all the verbiage. :o)]

If you really want to know then here it is READ READ This if you can. If not forget the question Concepts-Techniques-and-Models -of-Computer-Programming pdf http://www.librecours.org/documents/5/521.pdf Preface To pdf Six blind sages were shown an elephant and met to discuss their ex-perience. “It’s wonderful,”said the first, “an elephant is like a rope: slender and flexible.” “No, no, not at all,” said the second, “an ele- phant is like a tree: sturdily planted on the ground.” “Marvelous,” said the third, “an elephant is like a wall.” “Incredible,” said the fourth, “an elephant is a tube filled with water.” “What a strange piecemeal beast this is,” said the fifth. “Strange indeed,” said the sixth, “but there must be some underlying harmony. Let us investigate the matter further.” – Freely adapted from a traditional Indian fable. “A programming language is like a natural, human language in that it favors certain metaphors, images, and ways of thinking.” – Mindstorms: Children, Computers, and Powerful Ideas [141], Seymour Papert (1980) One approach to study computer programming is to study programming languages. But there are a tremendously large number of languages, so large that it is impractical to study them all. How can we tackle this immensity? We could pick a small number of languages that are representative of different programming paradigms. But this gives little insight into programming as a unified discipline. Another approach is focus on programming concepts and the techniques to use them, not on programming languages." Programming Languages are like vehicles that are used for different purposes. Some fast race cares , others carry cash /large loads, some for security highway patrol, some for entertainment like traveling circus/motorcycles/sports cares, some for military, some for scientific purposes moon land rover. Some corporations/agency's want to control the whole freeway system like Microsoft, Google , NSA National Security Agency (Big Brother / 1984). Jesus Be With You Always Think4Ever

Necessity is the mother of invention Each language as its own advantages and disadvantages. Each language as specific to operating system or indepedent to the operating system the application will run. If we take c or c++ languages application can target to particular operating system with standalone applications if the application i need that target network if i use c 0r c++ it takes developement time more and security we consider of that so i go for java, php, .net etc for this. This ans with my knowledge any wrong pls correct answer