Cool colors are hues that evoke a sense of calmness and tranquility. They typically include shades of blue, green, and purple. These colors are often associated with nature, such as the sky and water, and can create a soothing atmosphere in various settings, from homes to art. In design and art, cool colors can help to recede objects, making them appear further away. This effect can be used to create depth in a painting or to make a room feel more spacious. Cool colors are also commonly used in branding to convey feelings of trust and professionalism, as seen in companies like Facebook and Twitter.