Color Wheel

Adobe Illustrator Color Wheel

     It matters what colors companies use for their logos and their products because in the human mind all colors symbolize certain emotions, feelings, and ideas, and companies can use colors to invoke these ideas and emotions in people, using them to help sell their product/service.

Red - Love, Violence, Blood, Anger

Green -  Nature, Environment, Envy, Newness

Blue - Technology, Water, Sadness, Innocence

Black - Night, Darkness, Evil, Unknowingness

White - Light, Day, Peace, Knowledge

Purple - Royalty, Piety, Prestige, Wealth

Yellow - Sun, Cowardliness, Joy, Sickness

Orange - Warmth, Fire, Harvest, Tropics

Brown - Decay, Filth, Earth, Home

http://symbolism.wikia.com/wiki/Brown

http://symbolism.wikia.com/wiki/Orange_(Color)