Unreal Engine 4 (UE4) has been available since November 2014. In the seven years since its release, UE4 has undergone significant improvements and updates that have made it one of the most popular game engines on the market.

One of the key features of UE4 is its real-time rendering capabilities. This allows developers to see their creations in action as they are being built, which can greatly speed up the development process. UE4 also includes a number of tools for creating realistic visual effects, such as physics simulations and weather systems.

Another important aspect of UE4 is its support for virtual reality (VR) development. The engine includes a number of VR-specific features, such as VR controllers and tracking, which make it easy for developers to create immersive VR experiences.

Over the years, UE4 has also received numerous updates and improvements. For example, in 2017, Epic Games released version 17 of UE4, which included a number of new features such as ray tracing, dynamic lighting, and improved performance. In 2020, UE4 was updated again to include support for the latest versions of DirectX and Vulkan, which are two popular graphics APIs used in modern computer games.

Overall, UE4 has proven to be a powerful and flexible game engine that has been widely adopted by developers of all sizes. Its real-time rendering capabilities, support for VR development, and numerous updates and improvements have made it a popular choice for creating a wide range of games and other interactive experiences.