Describe the flag of the United Kingdom?

All countries has their own flags and all of them has interesting history of occurrence. In 1625 a small flag was mounted on the warship which name was Jack since that time the flag name become Union Jack. The Union Jack represents the union of all countries which belonged to the British Isles. The colors of flag are red, white and blue it consists of the red cross of Saint George patron saint of  England, edged in white, superimposed on the Cross of sent Patrick patron saint of Ireland and the cross of St. Andrew patron saint of Scotland divided diagonally. The Union Jack is included into another flags you can see it in a Australian, New Zealand, Hawaii, British Columbia, Ontario national flags.