The grid view helps with three-dimensional orientation in the editor. It also points the place where your model is on the X, Y and Z axes. You can switch the view of your grid either manualy by moving your mouse and the grid will snap to one of the views or using the TAB button. You can switch the view to one of the following: Bottom, Front, Right, Perspective, Back, Top, Left. You can hide the grid by right clicking on the scene and choosing the Hide Grid option, alternatively, you can use the Ctrl + ' shortcut.