A new website on the monarch's life has been launched to mark the Queen's 80th birthday on 21 April.
The website charts the Queen's life from her birth in the 1920s...
Photographs, documents and other archive material charting the life of the Queen, decade by decade, are online at www.royal.gov.uk/queen80.
Galleries illustrate the Queen's life and documents such as her birth certificate and letters are included.
On her birthday, the Queen will meet members of the public in a walkabout outside Windsor Castle.
She will be accompanied by the Duke of Edinburgh and will later attend a birthday dinner hosted by the Prince of Wales.
...To the present day
The day before that, the Queen will visit the BBC to mark the 80th anniversary of the granting of the Corporation's Royal Charter.
She will reopen Broadcasting House in Portland Place, central London, which has been undergoing redevelopment.
She will also visit the Royal Institute of International Affairs, Chatham House, to mark the 80th anniversary of the granting of the Institute's Royal Charter.
The website features a series of interactive galleries illustrating the Queen's life and contains more than 160 images.
Pictures include the then Princess Elizabeth with her sister Princess Margaret, dressed in costume as they rehearse for a family pantomime in 1941 at Windsor Castle.
Letters include her first letter to her grandmother, Queen Mary.
Addressed to "Her Majesty The Queen", it reads: "Darling Granny, Thank you very very much for the lovely doll's house. I do love it, and I have unpacked the dining room and the hall. Love from Lilibet xxx."
There is also a quiz on The Queen's life and a page enabling visitors to send her a birthday greeting.
For schools, the website has a free two-metre commemorative timeline wall chart.
Filled with illustrations, it shows some of the historic events and social changes which have taken place within the last 80 years, alongside key events in the Queen's life.
The Monarch has her official birthday celebration on 17 June.