Yellow is the color of light whose wavelength is between 565nm and 590nm or is a mixture of red and green light, that appears to be the same color. If you browser supports color tables, the following square will be yellow:
Yellow is also one of the primary pigments.
Usage, symbolism, colloquial expressions
Yellow is a bright cheerful color, but in the English language, yellow is associated with cowardice. A coward is said to have a "yellow belly". It can also mean that something is tainted, as in the expression "yellow journalism".