Picture of an infinity pool on a rooftop

Quick answer：

An infinity pool, also known as a vanishing edge pool, is a pool that appears to have no edge due to its design where the water flows over the side into a channel. This creates the illusion that the water continues endlessly into the horizon. Rooftop infinity pools are a luxury feature often found in upscale hotels and private residences, offering breathtaking views and a unique experience. They can be designed with different shapes and sizes, but the key element is the channel that carries the water over the edge, blending the pool with its surrounding environment.