Depending on what country you are in, the difference between college and university are how the terms are used differently. In the United States, the two terms are used interchangeably, and both mean a school at the postsecondary level. Otherwise, the term university usually means a large institution that offers graduate and doctorate programs while college means undergraduate degrees or associate degrees.
In the United Kingdom, colleges are schools found with a university and they do not award degrees or are a part of the program that the university used to award a degree. Colleges can even be something other than a learning institution and can be related to the facilities or accommodations in a university. Sometimes, the term college will refer to a secondary education institution where students can earn advanced qualifications.
In Canada, the term college will usually refer to vocational, artistic, technical and scientific third state education. There is also a term in Canada of University college which means a college that is not recognized as being completely independent the same way as a university is.
In Australia, the term college means secondary education and is not commonly used for specific vocational schools or schools inside a university. The term faculty is more often used instead of college at the third level of education.