endl

endl does 2 things:

• write a line feed/new line character
• flush the Buffered outputs We can print new line

std::cout << "Hi" << std::endl; // Hi\n

It is best practice to output with newlines for every line if possible

Obsolensce

it is just better to use \n instead.

1. its better to let the system flush the buffers periodically(which it is designed to do efficiently)
2. shorter, easier to remember