This document discusses the role of university rankings in an international context, using the I-UGR Rankings for Spanish universities as a case study. It notes that while international rankings are useful for comparing world-class universities globally, they have limitations like neglecting national university systems and disciplinary focus. The I-UGR Rankings were created to address these issues for Spain. The document also compares the I-UGR Rankings to other international rankings, finding some fields correlate better than others. It concludes that national and international rankings can complement each other when used and compared carefully despite methodological differences.