Yellow Color Meaning – The color of optimism. Yellow is a compelling color that conveys youthful, fresh energy. This color of sunshine is uplifting and illuminating and associated with success and confidence. Yellow stimulates the left side of the brain, helping with clear thinking and quick decision making. Yellow grabs attention because the eye sees yellow first. The downside of yellow is that it can induce anxiety and cause one to be over-critical. It also signifies cowardice.