What is D language?

Question

What is D language? Is it an upgrade version of C language?

Answer 1

It's not an upgrade, it is a new language

Answer 2

D is a language that, similar to Java and C#, is an evolution of C++. But it has kept on evolving over time and version 2 of the language has many unique features now. In short:
- native binaries (like C++, unlike Java/C# that runs inside a VM)
- uses GC (unlike C++, but like Java/C#)
- OOP (like C++/Java/C#), but with some FP features (such as function purity).
- Very strong templates/template-meta-programming capabilities (like C++, very limited in Java/C#)
- Concept of ranges (evolution of the CPP concept of iterators)
- UFCS to allow component based programming.
- Very powerful CTFE (compile time function evaluation)
- etc... (many more)

Sorry for all the acronyms, but you can check out the details (and acronyms!) at http://dlang.org.