https://www.usnews.com/education/best-global-universities/articles/methodology
Since an increasing number of students enroll in universities outside of their home countries, these rankings – which focus exclusively on institutions' overall academic research and reputations and not on their separate undergraduate or graduate programs – can help those applicants compare institutions around the world.
https://www.usnews.com/education/best-colleges/articles/how-us-news-calculated-the-rankings
Based on statistics, the top-ranked schools provided ample classroom resources for students and faculty; conferred bachelor's degrees at high rates; and produced graduates who entered the workforce with manageable debt and worthwhile starting salaries.