A tagline is your immediate opportunity to clearly tell visitors what you have to offer. If they're not sure what you have to offer - they'll look for a website where they are sure - your competitor's.
Your tagline is the most important ad piece you'll ever create. A tagline must be succinct - meaning it should say as much as possible in as few words as possible. To capitalize on this one line sales pitch, find a way to clearly include your service offering and why your offering is unique to competitors.
Things to remember when creating a tagline: