String Vs Ch Array C++

Question

When to use string and ch array?
Is there any performance difference?
Can I use string all the time?

char arr[10];
getline(cin , arr);

string arr;
cin >> a;

Answer 1

Do not forget google!
https://www.geeksforgeeks.org/char-vs-stdstring-vs-char-c/

Answer 2

char arr[10];
getline(cin , arr);

string arr;
cin >> a;

Is there only syntax difference between these two? When to use string and when to use ch array

Answer 3

So on stack overflow I found the difference between these two
char arr[10];
getline(cin , arr); // it allows spaces to store and read full line

string arr;
cin >> arr// it stops storing when space comes

Input : hello world
Output : hello