One of the great benefits of Twitter is that it allows for content to spread rapidly and virally across the network and allows for many people to easily discover and share your Tweets. Twitter is a conversationally driven social network with very few points of friction and allows for your messages to flow to large numbers of people quickly.
Twitter users will share content that they discover and that they find interesting, valuable, insightful or newsworthy that they think will benefit their network of followers. A retweet could best be described as the act of sharing content discovered on Twitter to a network of followers or to ask for your followers to echo and pass forward and share with their Twitter network.
Retweet sharing can have huge benefits for your business. Tapping this viral behavioral component and leveraging the psychological carriers is crucial if you want your Twitter messages to reach as large an audience as possible.