Read the following question and then pick a category that describes the question.
Question: Name the operating system that runs on IBM-compatible machines .
What category is the question in? Choose one from Abbreviation, Entity, Description and abstract concept, Human being, Location, Numeric value. Respond with only the category and no additional text.
Entity
Description and abstract concept. (The question is asking for a description of the operating system that runs on IBM-compatible machines, which is an abstract concept