National Pink Day is celebrated on June 23, 2021. Take care, that all your clothings and accessories are pink on this day! National Pink Day is especially a day for the ladies, because pink is a girl's favorite color. Pink is any of the colors between bluish red (purple) and red, of medium to high brightness and of low to moderate saturation.
The association of pink with girls dates to the modern era, probably developing at different times in different countries. The foremost student of the role of color in children's fashion, Jo Paoletti, found that "By the 1950s, pink was strongly associated with femininity" but to an extent that was "neither rigid nor universal" as it later became. Some date the origin of the association of pink with girls in the United States to the 1910s or 1920s. Many have noted the contrary association of pink with boys in 20th-century America.
One study by two neuroscientists in Current Biology examined color preferences across cultures and found significant differences between male and female responses. Both groups favored blues over other hues, but women had more favorable responses to the reddish-purple range of the spectrum and men had more favorable responses to the greenish-yellow end of the spectrum. (With material from: Wikipedia)