The colour red is typically associated with a range of emotions and states of being, including: energy, passion, love, joy, vitality, health, strength, power, fire, aggression and danger. Different people perceive colours in different ways, so you may have other associations, which are equally valid.
Throughout ancient traditions, red has been a dominant colour, symbolising both positivity and negativity. It's been used to represent the colour of gods of sun and war and is often associated with power. In China it was the emblem of the Chou dynasty and was thought of as being one of the luckiest colours. In Christianity red is associated with the act of sacrifice, representing the blood of Christ who died on the cross. Red is a particularly dominant colour in the Tarot.
The colour has links with passion and sexuality, too. Hearts are usually depicted as red and it features widely in the annual celebration of St. Valentine's Day, and in Greece it was the colour of the phallic God, Priapus. Young North American Indians traditionally painted themselves in red, believing it would increase their strength and desire.
As far as the chakras go, red is the colour used to symbolise the base chakra.
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