Explanation:

Exp: People who are engaged in primary   activities are called red collar workers due to the outdoor nature of their work.    The pink-collar term was coined during theSecond World War, when women occupied jobs as secretaries, typists, and transcribers. But as the U.S. economy evolved, these jobs became defined as those that were traditionally dominated by women.

The terms "blue collar" and "white collar"are occupational classifications that distinguish workers who perform manual labour from workers who perform professional jobs. Historically, blue-collar workers wore uniforms, usually blue, and worked in trade occupations.