The tool that is usually used to draw a circle is called a compass or a pair of compasses. It is a technical drawing tool usually used for forming circles and arcs. They can also be used as tools to measure distances, in particular in maps. Compasses are not only used to draw, but also serve other purposes on math, drafting, and navigation. Before the computer era, compasses and other tools for manual drafting were often packaged as a set. By the mid-twentieth century, circle templates replaced the role of compasses. Today these facilities are more provided by computer programs so the physical tools serve mainly aa didactic purpose in teaching geometry, technical drawing, etc.
There are plenty of ways you can do to draw a circle but you don't have a compass. You can of course use a circle template to draw as many circles as you want. This is probably the easiest way to draw a circle, but you have to have various circle template sizes if you need to draw different sizes of circles.
The other thing you can do is to use the help of rounded objects to trace. It can be a cup, a bowl, a plate, or any other round object.
You can also draw a circle freehand but don't expect the result to be as perfect. There are a lot of hacks explaining how to draw a circle freehand. One of the most popular is to use your little finger as a pivot as you hold the pencil and rotate the paper underneath.
A circle template is a tool that can be used by anyone in any level of skill. Either you are a student or you are a designer, you may need a circle template to draw. It is not only a great tool to draw a circle, it serves more purpose than that.
But first, you need to buy a circle template. We often see a variety of different templates with different sizes, but you need to choose one that serves your needs. A circle template with a wide range of circle sizes should be the best option to get.
Now, how do you use a circle template? You can use it to draw circles, of course. But a circle template also can be used as a scale. You can also use them to make rounded corners, and so on.