Virtual reality uses computer technology to create simulated environments that users can interact with and immerse themselves in. There are several types of VR, including immersive VR using head mounted displays, augmented reality which blends real and virtual environments, and desktop VR. VR has applications in gaming, training, business, engineering, healthcare, education, and more. It provides advantages like interaction, improved understanding, and reduced costs. However, VR also has disadvantages like high costs, potential eye and brain health effects. The future of VR is promising as hardware improves and costs decrease.