Her Majesty the Queen
Queen Elizabeth II was born on 21 April 1926. Today she is Queen of sixteen countries throughout the world: the United Kingdom, Canada, Australia, New Zealand, Jamaica, Barbados, the Bahamas, Grenada, Papua New Guinea, the Solomon Islands, Tuvalu, Saint Lucia, Saint Vincent and the Grenadines, Antigua and Barbuda, Belize, and Saint Kitts and Nevis. She is the queen of each country separately, and all sixteen are independent countries. She became Queen when her father, King George VI, died on 6 February 1952.
The countries of which she is Queen are known as Commonwealth realms. Their total population is over 129 million. Elizabeth II lives in the United Kingdom. In all the other countries where she is queen, a person has been chosen to represent her. This person is known as the Governor General.
Elizabeth II is Queen and is interested in the running of her countries, but she does not tell the governments what to do. She has regular meetings with people from her governments, but it is they who run the countries. She performs ceremonies for the governments, gives out honours, and visits and supports many charities.
Since 1947, the Queen has been married to Prince Philip, Duke of Edinburgh. Prince Philip was born into the royal families of Greece and Denmark. Just before they were married, he became a citizen of the United Kingdom, and changed his name to Philip Mountbatten. He became the Duke of Edinburgh on the day he married, and became a Prince of the United Kingdom in 1957. The Queen and Prince Philip have four children, eight grandchildren and three great-grandchildren.
Source: Simple English Wikipedia
Here are a few links to learn more about Queen Elizabeth:
An exclusive interview with the Queen: video
10 things you didn’t know about the Queen: video