Hair shades refer to the various colors and tones that hair can exhibit, ranging from natural hues like black, brown, blonde, and red to artificial colors such as blue, pink, and green. Each shade can have different undertones, which can affect how the color appears under different lighting conditions. Hair shades can be altered through various methods, including dyeing, highlighting, and balayage. Many people choose to change their hair shade for aesthetic reasons or to express their personality. The choice of hair shade can also be influenced by trends, cultural factors, and individual preferences.