How would you describe what Skeleton Racing is?

for a school project, i have to make a brochure about skeleton racing and on the first side i have to say what it is as if talking to someone who's never heard of it but honestly i no less than nothing about skeleton! all the websites i've found have 1 or 2 line answers that are impossible to expand on so if you know a good website or can help me out it would be much appreciated!