Does Expedia offer travel insurance?

Good day to you all,

I recently heard about Expedia, and I am interested in booking a family vacation through them. But before I do so, I'd like to know more about them. Do they offer any kind of travel insurance? If they do, what does it cover? Can I add the insurance to my plan after booking, or do I have to choose it first?

But also, in case I decide against it, what would happen if our flight got canceled without travel protection? Sorry if that's a bit too many questions, but thank you for answering.