A more thorough explanation:

Sideline business

A sideline business is a way to make extra money by doing a business activity on the side. This can be done while working a full-time job, running another business, or having other commitments. The goal is to generate additional income.

• A teacher who tutors students after school for extra money
• A graphic designer who sells handmade crafts on Etsy
• A stay-at-home parent who starts a small baking business from home

These examples illustrate how people can use their skills and interests to create a sideline business. They are able to make extra money without having to quit their current job or give up their other commitments.