It's exactly one year until people in Scotland will be making a big decision: should Scotland be part of the UK?
Voters will be asked "should Scotland be an independent country?" and will have to choose "yes" or "no".
Scotland has been part of the UK for more than 300 years and the vote could change the shape of the UK forever.
The referendum is also breaking new ground, as for the first time the voting age will be lowered, to give 16 and 17-year-olds the chance to vote.
The elected party in Scotland, the Scottish National Party, wants independence from the UK and complete control over the way the country's run.
But the British Prime Minister, David Cameron, doesn't want this to happen: he believes that Scotland should remain part of the United Kingdom.
In 1999, the Scottish Parliament was created to give more power to the people in Scotland, to make decisions about how their country is run.
This was part of a process called devolution, where Wales created the Welsh Assembly.
In 2011, when the Scottish National Party won the election in Scotland, they promised to let people decide for themselves whether to stay part of the UK or go it alone.