A blue-collar job involves doing physical labor, working with your hands and body to do paid work. Examples of blue-collar workers include mechanics, construction workers, and electricians.
Blue-collar jobs involve manual labor and skilled trades. Factory workers, custodians, plumbers, and landscapers are considered blue-collar workers. Blue-collar jobs are often contrasted with white-collar jobs, which are typically done in offices, sitting at desks. The term blue-collar first appeared in the 1920s, referencing the durable, blue work-shirts and denims that many laborers traditionally wore. Blue-collar workers are essential to building and keeping infrastructure and industries running smoothly.