why do I need c++

Answer 1

https://www.quora.com/What-interesting-things-can-I-make-using-C++
https://www.upwork.com/hiring/development/cplusplus-the-language/

Answer 2

Because it is a Low Level programming language and similar to C wich is the "mother" to the most other Programming languages.

Answer 3

It's very good language. But it's not obligatory. For example you can be good web developer,and for this you don't must know C++