Sometimes you want to get an idea of how a scene looks without rendering. You can do this with the Viewport Shading menu as shown in the following screenshot:
On the header at the bottom of the 3D window, there is a blank white circle, as highlighted in the previous screenshot.
Click theLMB and a menu appears as shown previously.
Scroll up to the circle with the checkerboard and the word Texture.
Press theLMB.
Press 7 on the Numpad to see the top view.
Move the lamp close to one corner of the cube as shown in the following screenshot.
Press 1 on the Numpad to see the front view.
Move the lamp close to the cube.
Press 0 on the Numpad to see the view from the camera.
Move the lamp. What happens? The difference is illustrated on the left and right of the following screenshot.