A universal testing machine is like a big robot that helps us figure out how strong something is. Let's imagine you have a toy that you want to test how strong it is. You put the toy in the universal testing machine, and the machine starts to squeeze it really, really tightly.
The machine can tell us how much force it's using to squeeze the toy and how much the toy can handle before it breaks. We can also use the machine to stretch things or bend them to see how they hold up.
The universal testing machine is very useful for scientists and engineers, who need to know how strong different materials are or how they will hold up under different conditions. It can help us make safer cars, buildings or airplanes.