The meaning of the explanation of the tag of the editing screen?

Question

I do not understand enough the meaning of the explanation of the tag of the screen which I edit a question.

Source: qa-include/qa-lang-question.php (L98)
Statement: 'q_tags_label' => 'Tags - use hyphens to combine words:',

When it writes some tags, separate them by space or comma? The meaning to explain HYPHEN?　Will there are some good things when connected at hyphen when I search database with "like"?

Thanks in advance.

Answer 1

You can separate tags by spaces or commas (or lots of other symbols). But you can use hyphenated tags like bug-report or south-america, which will be considered as one word when indexing and searching.