V2Ray is a tool under Project V. Project V is a project that includes a set of tools for building specific network environments, and V2Ray is the core one. The Project V manual said Project V is a set of tools to help you build your own privacy network over the internet. The core of Project V, named V2Ray, is responsible for network protocols and communications. It can work standalone, as well as combine with other tools. However, in terms of launching time, Project V is prior than V2Ray. If you still don't understand, then we simply say, V2Ray is a similar proxy software to Shadowsocks. V2Ray can be used to access the internet (over the censorship) to learn advanced science and technology from the free internet.