why convert char 2a to string c 2b 2b

1// example
2char sczName[] = {"Jakes"};
3std::string strName = std::string(sczName);
4
5/* SYNTAX
6#include <string>
7std::string(<char-to-convert>)
8*/

1char *cStr = "C++";
2std::string Str = std::string(cStr);

1#include <iostream>
2using namespace std;
3
4int main()
5{
6  char c = 'l';
7  string str;
8  str.push_back(c);
9}