Voting has ended in the highly anticipated general election in the United Kingdom. It will determine the fate of Gordon Brown's Labour government, which has been in power for the past 13 years.
The casting of ballots across England, Scotland, Wales and Northern Ireland caps a month-long election campaign marked by Britain's first-ever televised debates among the leaders of the three main parties.
The Conservatives, led by David Cameron, are hoping to return to power after 13 years as the opposition.
Observers believe this election is likely to be the closest since 1992, when the Conservatives were returned to power. For that reason Nick Clegg and the Liberal Democrats - known as the "third force" of UK politics - may have a crucial role to play after election day in helping either party secure a parliamentary majority.
On a more localized level, smaller parties, as well as national parties in Scotland, Wales and Northern Ireland, are likely to have an impact on voters in their constituencies.
So what do you need to know?
If you're in the dark about how things work in the U.K. you can check out our explainer on how the political system and elections work in the U.K. Then, follow as election results and details come in on our U.K. election blog, on Twitter by following @UKelectionCNN and tune into CNN’s UK election coverage with Becky Anderson and Richard Quest on CNN.com/Live or on CNN’s iPhone app starting at 5 p.m. ET Thursday.
Meanwhile, we'll try and break down the rest of the details for you right here - starting with the key figures.
Could election be too close to call and create a "hung parliament?"
Many people believe because the race is so close - it may well end without a definite result. One of the parties will have to win a minimum of 326 seats to take the majority - more than half the total of 650 being contested.
If any party is unable to win a governing majority it could create a "hung parliament," essentially a deadlock. Without a majority in parliament, a government becomes dependent on MPs - or lawmakers - from other parties to get its program voted through the House of Commons, the chamber which passes laws and legislation. How can this happen and what does it mean? CNN's Political Contributor Robin Oakley, a veteran of 12 UK elections, explains what could happen and why.
What would happen next?
The party with the most seats could try and form a minority government or launch a partnership in a coalition government.
If you haven't been able to wrap you're head around that and just want to take a peek at where all the action will take place as a tourist, you can always check out our panoramic view of Parliament Square.