A university is a typically a collection of colleges (or schools).

For example: Harvard University is made up of Harvard College, Harvard Business School, Harvard Divinity School, Harvard Kennedy School, Harvard Law School, Paulson School of Engineering and Applied Sciences, etc.

For all intents and purposes - we use the word “college” and “university” interchangeably because they’re the same level of education. Either can do associates through doctoral.

Community colleges, however, only focus on 2 year degrees and certain certifications.

In the US, universities have a significant number of graduate degrees along with undergraduate degrees while colleges offer (almost) exclusively undergraduate degrees. My alma mater became a university shortly before I started because they started offering enough graduate degrees.