Which language we use in Arduino IDE ?

Question

People are say its c and c++ but syntax is too different
Why ?

Answer 1

"The Arduino IDE supports the languages C and C++ using special rules of code structuring. The Arduino IDE supplies a software library from the Wiring project, which provides many common input and output procedures."
https://en.m.wikipedia.org/wiki/Arduino#IDE

Answer 2

I don't have the Arduino so I don't know but I would think that the processor is different from the windows processor.

On windows you have the x86 or x64 processor.
With a other processor you have a other assembler.