Biggest school in the world world?

It's impossible to definitively say which school is the "biggest" in the world because there's no single, universally accepted definition of "biggest."

Here's why:

* Size can be measured in many ways: Do we mean the largest student population? The biggest campus area? The largest number of buildings? The school with the widest range of subjects offered?

* Different types of schools: Are we talking about primary schools, secondary schools, universities, or something else?

* Data availability: Comprehensive and accurate data on all schools worldwide is not readily available.

However, here are a few schools that are often mentioned as contenders for "biggest":

* City University of Hong Kong: With over 40,000 students, this is one of the largest universities in the world.

* University of Delhi: Also with a student population exceeding 40,000, this is another major university.

* The National Open University of Nigeria: With over 800,000 students, this is a large distance learning institution.

Ultimately, the "biggest" school depends on your definition of "biggest."