It may not be surprising to see someone wearing red but there's an extra meaning behind people wearing that color Friday. The first Friday of February every year is National Wear Red Day, a holiday that aims to raise awareness about women's heart health.

The first Friday of February is National Wear Red Day, where the nation is encouraged to wear red to raise awareness for cardiovascular disease. This year, National Wear Red Day lands on Friday, Feb.

According to the American Heart Association, cardiovascular disease is the No. 1 killer of women, causing one in three deaths each year.