.ac.uk is a domain suffix used by academic institutions in the United Kingdom. However, there are a variety of synonyms for the same. Some of them include .edu.uk, .sch.uk, .ac.org and .edu.org. These domain suffixes too are used by academic institutions, schools, and universities across the UK. While .edu.uk is commonly used by institutions with a focus on higher education, .sch.uk is used by primary and secondary schools. .ac.org is used by institutions that are primarily non-profit and involve research and education, while .edu.org is used by educational institutions that are non-profit as well. All these synonyms aim to serve the same purpose of identifying educational institutions in the UK.