Final answer:
A service job involves providing a service to others and can include a wide range of occupations. In the 21st century, a significant portion of the U.S. workforce is employed in service jobs.
Step-by-step explanation:
A service job is a type of employment that involves providing a service to others.
This can include a wide range of occupations such as healthcare, education, retail, hospitality, and customer service. Service jobs require different levels of education and training, and the wages can vary significantly.
In the 21st century, there has been a shift towards service jobs in the United States.
According to the U.S. Department of Labor's Bureau of Labor Statistics, the majority of the workforce is now employed in service jobs. In fact, by the beginning of the 21st century, around 18 percent of the U.S. workforce was working in service jobs.