A Render Texture is a type of TextureAn image used when rendering a GameObject, Sprite, or UI element. Textures are often applied to the surface of a mesh to give it visual detail. More info
See in Glossary that Unity creates and updates at run time. To use a Render Texture, create a new Render Texture using Assets > Create > Render Texture and assign it to Target Texture in your CameraA component which creates an image of a particular viewpoint in your scene. The output is either drawn to the screen or captured as a texture. More info
See in Glossary component. Then you can use the Render Texture in a MaterialAn asset that defines how a surface should be rendered. More info
See in Glossary just like a regular Texture.
To create a live arena camera in your game: