Solid torus

Imagine you are playing with some play dough. If you roll it out into a long snake, that would be like a line. Now, if you take the two ends of the play dough snake and connect them together, you have a circle.

Now, imagine you took that circle and pulled it out in the middle so it makes a little doughnut shape. That, my friend, is a solid torus.

It's a three-dimensional object that looks like a squished doughnut or a tire. It has a hole in the middle like a regular doughnut, but instead of being flat, it's a round, puffy shape that goes all the way around.

Scientists like to study solid tori because they can help us understand how things move in three dimensions. They're also super important in a branch of mathematics called topology, which deals with how objects can be stretched, bent, and twisted without actually breaking or having any holes in them.