What does Visual Studio mean by normalize inconsistent line endings?

Question

Visual Studio occasionally tells me:

The line endings in the following files are not consistent. Do you want to normalize the line endings?

Answer 1

It means that, for example, some of your lines of text with a (the Windows standard), and some end with just a (the Unix standard).

If you click 'yes' these the end-of-lines in your source file will be converted to have all the same format.

This won't make any difference to the compiler (because end-of-lines count as mere whitespace), but it might make some difference to other tools (e.g. the 'diff' on your version control system).