Flags come in various shapes and colors and represent different entities like countries, states, organizations, and religions. The study of flags is called vexillology. Most flags are made of cloth in a rectangular shape with emblems or color combinations. Common colors used are red, white, and blue which symbolize bravery, peace, and loyalty respectively. The United States flag was first adopted on June 14, 1777 and has undergone modifications over time but is still affectionately known as the "Red, White and Blue" or the "Stars and Stripes".