Jumpscare
A jumpscare is a way to scare the audience using sudden, loud noises and/or quick visual changes. It is not only used in horror movies, but also in many video games as well. They are often criticized, with people saying it is a cheap and/or lazy way to scare the audience.
Jumpscare Media
The poster for Cat People (1942), which featured the Lewton Bus technique, considered the first jump scare