Precision aerobatics is a type of disciplined RC airplane flying where pilots strive to perfectly execute a series of aerobatic maneuvers. Pattern Airplanes especially in the top levels of competition, are specifically designed to fly aerobatic maneuvers perfectly. A pattern plane's length and wingspan must be two meters or less, and the total weight must be 11 pounds or less. Other than that, there are really no other restrictions.
Many pilots are perfectly content flying around aimlessly while "boring holes" in the sky. There's nothing wrong with that if that's what makes you happy! Perfecting aerobatic maneuvers gives you a purpose and a set of goals to work towards when flying your RC airplane. You not only compete with others, but you compete with yourself as you strive to perfect each maneuver by practicing them over and over. Most pattern pilots consider themselves as their biggest competitor! It takes a lot of discipline to really get good at pattern flying. But there's more to it than just flying. You will develop long lasting friendships with pilots all across the country. It's a huge family of pilots that share a common interest and strive to help one another succeed by sharing their experiences with different types of aircraft, set-ups, and flying techniques.