It's time to make an animation. Animation adds a fourth dimension to 3D. Besides X, Y and Z, there is time. In animation, time is broken into frames, a sequence of individual images such as frames of a movie. This is usually expressed as frames per second. As a rule of thumb, web animations such as animated gifs, banner ads, and YouTube videos can play at between 7 and 15 frames per second (fps); film plays at 24 fps and video plays at 30 fps. Blender renders at 24 fps by default.
Look at the window directly below the 3D window. By default, that is used as the Timeline window. The Timeline window lets us know how far along in an animation we are. Look at the following screenshot: