This year, Queen Elizabeth II is set to become the first-ever British monarch to celebrate a Platinum Jubilee.
Throughout 2022, the Queen and members of the Royal Family will mark 70 years since her accession to the throne.
The monarch was 25 years old when she became Queen on 6 February 1952.
There will be various events and engagements involving the Royal Family, culminating in an extended bank holiday of activities between 2 and 5 June.
Here's what you need to know about the military's role in the celebrations
Before the Platinum Jubilee weekend begins, there will be 500 horses and 1,000 performers at the Platinum Jubilee Celebration in May - including international military displays.
The Platinum Jubilee weekend begins on Thursday 2 June 2022 with Trooping The Colour on Horse Guards Parade by the 1st Battalion Irish Guards, and more than 1,200 officers and soldiers from the Household Division who will put on a display.
They will be on parade with musicians from the Massed Bands of the Household Division and Corps of Drums, and hundreds of horses.
Watch: The last Trooping the Colour in its traditional form was in 2019.
Personnel will proceed from Buckingham Palace down The Mall and on to Horse Guards Parade, accompanied by members of the Royal Family in carriages and on horses.
The Royal Air Force will close the parade with a flypast, watched by the Queen and her family from Buckingham Palace's balcony.
King’s Troop Royal Horse Artillery will also be on parade, with personnel due to fire a 41-gun salute from Green Park.
On Sunday 5 June the Platinum Jubilee Pageant will be part of events closing the weekend of celebrations.
It will feature people from the UK and across the Commonwealth.
Performers, dancers, musicians, military personnel, key workers and volunteers will tell the story of the Queen’s reign in the Platinum Jubilee Pageant, which will see a River Of Hope – made up of 200 silk flags – make its way along the Mall.