What is the difference between "C" and "C++"? and which is better to focus on?

Answer 1

C++ is built on top of C. C++ is a slightly higher level programming language.

http://programmers.stackexchange.com/questions/16390/what-are-the-fundamental-differences-between-c-and-c

Answer 2

C++ is object oriented. Meaning you can create objects and do operations on them. You can't do that in C.

Answer 3

C++ is better