URL text segment sanitizer. Sanitizes the content into a valid URL segment value which is usable in an URL without further processing. For example, the text "I am Mr. Brown, how are you?" becomes "i-am-mr-brown-how-are-you".
Also useful when creating anchor link names, for example for news entries in your custom EXT:news list template, in which case each news item's title would become an anchor:
And links would look much like the detail view links: