And what happens after today?
The first Hustings for members organized by the Conservative Campaign headquarters will be held in Birmingham.
The party intends to hold hustings in all 12 regions of the UK so that Tory members can see the candidates in action, and there will also be an opportunity for the public to interview them online.
Both the BBC and Sky have announced they will invite the last two candidates to participate in special television programs.
6th to 8th of July
Conservative members should receive their postal vote.
Week from the 15th of July
The last Hustings take place in London.
Week from the 22nd of July
A new leader will be announced after the election of 160,000 Conservative members.
Prime Minister Theresa May will then call on the Queen to formally resign and the new leader will be invited to Buckingham Palace to form a government.