What is a thriller ?

So this is the first post on my blog and its about the question ,, What is a thriller '' to be honest at this point of time i don't know a lot about thrillers.
But i think a thriller is a genre of literature and movies, that uses suspense and excitement as its main elements. Films of that genre have a lot of surprise,adrenaline and a bit of horror in it. I think the main aim of thrillers is to keep the audience alert and on the edge of their seats.

That's maybe wrong but i will learn a lot about thrillers in the next few months.