I just don't get the idea of implementations. What does that mean? Cpython was written in C to run Python programs, or it means something else?

Answer 1

This is the basic idea. Pypy is written in Python, Jython is in Java, IronPython is in .NET (I think), etc.

Answer 2

it's a scripting language. it means compiler used in Python is that of C etc

Answer 3

Harshini : No.
Python is not compiled. It means that the INTERPRETER is written in C