The flag is typically flown horizontally, with the red stripe on top, as it would be in a natural rainbow. Baker's first rainbow flag had eight colors, though the most common variant consists of six stripes: red, orange, yellow, green, blue, and violet.

Originally devised by artist Gilbert Baker, the design has undergone several revisions since its debut in 1978, first to remove colors then restore them based on availability of fabrics. Using a rainbow flag as a symbol of gay pride began in San Francisco, but eventually became common at LGBT rights events worldwide. Also known as the gay pride flag or LGBT pride flag, the colors reflect the diversity of the LGBT community and the spectrum of human sexuality and gender. The rainbow flag is a symbol of lesbian, gay, bisexual, transgender ( LGBT) and queer pride and LGBT social movements.