What is happening?A referendum is being held on Thursday, 23 June to decide whether Britain should leave or remain in the European Union.
Why is a referendum being held?Prime Minister David Cameron promised to hold one if he won the 2015 general election, in response to growing calls from his own Conservative MPs and the UK Independence Party (UKIP), who argued that Britain had not had a say since 1975, when it voted to stay in the EU in a referendum. The EU has changed a lot since then, gaining more control over our daily lives, they argued. Mr Cameron said: "It is time for the British people to have their say. It is time to settle this European question in British politics."
Who will be able to vote?British, Irish and Commonwealth citizens over 18 who are resident in the UK, along with UK nationals living abroad who have been on the electoral register in the UK in the past 15 years. Members of the House of Lords and Commonwealth citizens in Gibraltar will also be eligible, unlike in a general election. Citizens from EU countries - apart from Ireland, Malta and Cyprus - will not get a vote.
Who wants the UK to leave the EU?The British public are fairly evenly split, according to the latest opinion polls. The UK Independence Party, which won the last European elections, and received nearly four million votes - 13% of those cast - in May's general election, campaigns for Britain's exit from the EU. About half of Conservative MPs, including five cabinet ministers, several Labour MPs and the DUP are also in favour of leaving.
Why do they want the UK to leave?They believe Britain is being held back by the EU, which they say imposes too many rules on business and charges billions of pounds a year in membership fees for little in return. They also want Britain to take back full control of its borders and reduce the number of people coming here to live and/or work. One of the main principles of EU membership is "free movement", which means you don't need to get a visa to go and live in another EU country. They also object to the idea of "ever closer union" and what they see as moves towards the creation of a "United States of Europe".
Who wants the UK to stay in the EU?Prime Minister David Cameron wants Britain to stay in the EU, now he has got some powers back from it. Sixteen members of his cabinet also back staying in. The Conservative Party has pledged to be neutral in the campaign - but the Labour Party, SNP, Plaid Cymru and the Lib Dems are all in favour of staying in. US president Barack Obama also wants Britain to remain in the EU, as do other EU nations such as France and Germany. As mentioned above, according to polls, the British public seems pretty evenly split on the issue.
For more information click here