Citations & Local SEO (Search Engine Optimization)
Do you remember a time where you would open the phone book to the yellow pages to find a local plumber? Those days are long gone, but people are still looking for a local plumber. Now they look online.
Listing (citing) your business on over multiple business listing sites will ensure you're listed with all the other local business of the same industry, regardless of which search-site a potential customer is using.