The ACT test is a really important test that people take when they want to go to college. It helps college admissions officers figure out how smart you are and how well you might do in college.
The test is split up into different sections that test different things like reading, math, English, and science. You sit in a big room with lots of other people who are taking the test too, and you have to answer all of the questions on a special answer sheet with a pencil.
It takes a few hours to complete the whole test, and it can be really stressful because you want to do your best. But it's okay if you don't get a perfect score! Admissions officers also look at other things like your grades, essays, and activities when considering if they want you to go to their college.