What does "secondary school" mean?

Applying to College
1

I’ve been seeing different definitions on the internet which is why I’m confused

2

High school.

3

While true, that only invites the question “What is HS?” since the OP is intl.

For US universities, “secondary school” means grades 9-12 for systems with a 12 year pre-university educational system or the last 4-5 years of pre-university education for other systems.If you have questions about what a uni wants from you contact them directly.