This document is an excerpt from the EUR-Lex website
Glossary of summaries
Certain European Union countries have what are known as ‘opt-outs’, which are a means of ensuring that when a given country does not wish to join the others in a particular field of EU policy, it can opt out, thus avoiding an overall stalemate.
Examples of opt-outs include:
(1) The United Kingdom withdraws from the European Union and becomes a third country (non-EU country) as of 1 February 2020.