The European Union - often known as the EU - is an economic and political partnership involving 28 European countries. On 23 June Britain will decide by a referendum whether it will remain in the European Union or if it will leave – the so-called Brexit option. So are Britain better being in or out? It depends which way you look at it - or what you believe is important. Leaving the EU would be a big step - arguably far more important than who wins a general election - but would it set the nation free or condemn it to economic ruin? Big business - with a few exceptions - tends to be in favour of Britain staying in the EU because it makes it easier for them to move money, people and products around the world.