Primary colour
The primary colour is the colour assigned a leading role in an identity or interface system. It may signal actions, support recognition or highlight elements according to the design rules
What it means, how it is used and where it comes up, with its related concepts.
What it is and how it works
It need not cover the largest area or be the most frequently used colour. Its use requires balance with backgrounds, text and other colour roles. The importance of an action should also be understandable from its label and context, without depending on colour alone.
Also known as
Primary color