University enrollment rankings compare the number of students registered at different institutions. However, the comparison can be complicated because universities use different organizational structures.

A distance-learning university may serve students across an entire country, while another institution may coordinate hundreds of affiliated colleges. Multi-campus systems can also report enrollment differently.
For a fair comparison, readers should review the source, reporting year, and definition of enrollment used.
The Campus Review's university enrollment ranking guide explains these differences:
https://thecampusreview.com/study-abroad/largest-university-in-the-world/#UniversityRankings #HigherEducation #EducationResearch