Grid paper is just a page with a continuous square grid on it. It is also known as "quadrille paper" or "quad paper." The squares are generally a set size, such as 1/2 inch, 1/4 inch, or 1/8 inch, giving the paper a name like "1/2 Inch Grid Paper." On grid paper, no axes are drawn. You can't tell which way is up or down without referring to another image or plan. Standard graph paper has circles and lines of different sizes marked on it in inches. Some people call this "scale graph paper," but that term can also be used for other types of graphs (like percent scales). Circle grids come in several sizes, including 1-inch, 1-half-inch, 6-inches, and 12-inches. Line grids range from half-inch to 2 inches. Both circle and line grids are available in 4-by-5-foot sheets and smaller quantities. Standard graph paper is easy to find online and in office supply stores. That's just shorthand for saying you want half-inch circles at the points where the lines cross. The reason for this is that if you were to draw actual axes on your graph, they would almost certainly not be straight up and down. They might even overlap each other! So instead, we use these little circles to represent points along an axis.