Single line comments in C++ start with double slashes // and the compiler ignores them.
We use them to comment or document the code or use them as notes:
int main() { // this is a comment }
We can have multiple single-line comments:
int main() { // this is a comment // this is another comment }
Multi-line comments start with the /* and end with the */.
They are also known as C-style comments.
Example:
int main() { /* This is a multi-line comment */ }