Recreational balls are designed for the casual golfer, who usually has a low swing speed of 130 km/h or less and easily loses balls on the golf course. They are two-layer balls and their cover is harder than the core. They have lower prices than advanced balls.
Advanced balls consist of several layers (three or more) and have a soft cover and hardened core. These balls require a higher swing speed and thus more physical strength to compress properly at impact.
Then there are training balls, for practice, similar to recreational balls. These are designed to be inexpensive, and durable and provide a shorter flight distance, while still retaining the basic characteristics of a “real” golf ball. They typically have a harder core than recreational balls and a stronger, more durable cover.