"Blue collar" refers to workers who engage in manual labor or skilled trades, often in industries such as construction, manufacturing, and maintenance. These jobs typically require physical effort and may involve working with machinery or tools. Blue collar workers are essential to the economy, providing services and products that support various sectors. The term originated in the early 20th century when workers commonly wore blue uniforms or shirts to conceal dirt and stains from their jobs. Unlike white collar workers, who typically work in office settings, blue collar jobs often involve hands-on tasks and can vary widely in skill level and pay.