Yellow is the color of the sun and of gold. It represents life, energy, happiness and wisdom. In the spiritual realm, it signifies knowledge, enlightenment and understanding.
In many cultures, yellow is associated with royalty or power. In China, for example, Emperor Huangdi was thought to have been born under a golden dragon and so yellow became the imperial color.
In Hinduism, yellow is associated with Oudh (or Aguru), which is used in Ayurvedic medicine. It has a warming effect on the body and is said to be helpful in digestive disorders.
Yellow also has a long association with Buddhism. The Buddha was often depicted wearing robes of this color and it came to represent his teachings of Dharma (truth).
For Christians, yellow can represent joy or glory. In the Middle Ages, it was used as a symbol of hope during times of despair or sickness.
Ultimately, what each person associates with yellow will depend on their own cultural background and personal experiences. But there are some general meanings that tend to be shared across cultures: happiness, wisdom, knowledge and enlightenment