The drum baffles in a dryer are those plastic ridges that stick out in the drum. They look like this:

Without those drum baffles, the clothes would get wadded up into a tangled ball that wouldn't dry werf a shi'ite. If one of the baffles is broken off inside your dryer, it's an easy and inexpensive repair. Here's the part link to the baffle ==> Dryer Drum Baffle

And here's how to install it:

Source: Clothes getting all tangled, bar came off Kenmore 80 series dryer