In this article, we will take a look at the 20 side businesses you can start while working full-time. According to a report by Business Insider, 46% of Gen Zs and 37% of millennials have started side businesses or taken second jobs. Most second jobs or side gigs involve the use of technology or social media, such as gig work, product selling, online services, food delivery, social media influencing, and ride-sharing. Some of the most popular industries include retail trade, professional services, construction