Can you describe what the term "onsurfacecreated" means when developing a video game for an Android device?

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"The function known as OnsurfaceCreated is a common feature of video games created for the Android environment. It is called every time a drawing surface is created. This can happen when the game starts or becomes active after being sent to the background after the user opens up another application. It is also called when the orientation of the user's devise changes. Each of these activities causes the loss of the context of the game. Every asset is lost and needs to be recreated. All assets and application objects are recreated at the place the game was at when the context changed."