The UK and Europe have changed a lot since 2015 (Brexit), so voters are headed back to the polls to help Britain forge a new path forward. Here's a primer on Britain's snap election for the uninitiated.
General elections in the United Kingdom are supposed to be held every five years. (The next one was scheduled for 2020.) But an early, or snap, election can be held if at least two-thirds of lawmakers agree to it or if there's a vote of no confidence in the government.
Voters will choose lawmakers to fill all 650 seats in the House of Commons, the lower chamber of Britain's Parliament. The political party that wins the most seats controls the legislative agenda and will have a big say in how the UK gets out of the European Union.
There's almost no chance this election will change Britain's mind about getting out of the European Union. Both the Conservatives and the Labour Party -- the two biggest parties in Parliament -- are committed to following the will of the people and seeing Brexit through to the end.
Prime Minister Theresa May and Labour Party leader Jeremy Corbyn loom large over this vote. May took over as Prime Minster after David Cameron stepped down last year in the shocking aftermath of the Brexit referendum result. She repeatedly said she wasn't going to ask for a snap election, then shocked everybody back in April by doing just that.
May and her fellow Conservatives have a smallish majority right now in Parliament, and she'd like to get a bigger one. It would put her in a stronger position to deal with the EU on Brexit.
Corbyn and his Labour Party have been sniping with May and the Conservatives over exactly how Britain should leave the EU. They see the election as a chance for them to increase their numbers in Parliament.
If last year's Brexit referendum was about whether the UK should leave the EU, this snap election is seen as a referendum on how the UK should get out of the EU. And the choice is pretty stark. May and the Conservatives have a vision of a "hard" Brexit, meaning the UK makes a clean break from the European Union.
A recent survey revealed terrorism is the second-biggest issue that Britons worry about, after health care. And that was before an early June deadly attack in London, which came less than two weeks after the bombing at an Ariana Grande concert in Manchester.
Whoever comes out on top in all of this won't have much time to celebrate. Those tough Brexit negotiations between the UK and the EU start just 11 days after the election, so the winning party will have to move quickly to form a new government.