On 23 June 2016, the majority of the UK's electorate voted to leave the European Union. "Brexit" will become effective on 29 March 2019 and when the negotiations on the terms of exit have been concluded.
Until then, the UK remains an EU member state with all rights and obligations.
It is important to note that the referendum result in itself has no immediate effect on the nationality, residence or social security status of EU citizens in the UK. MORE INFO
More on protecting EU citizens' rights in the context of Brexit can be found HERE
Further Information for European Union citizens living in the UK HERE