Final answer:
Secretaries, nurses, waitresses, and office clerks are categorized as pink collar jobs, which refer to roles traditionally associated with women's employment and often involve service or support work.
Step-by-step explanation:
Secretaries, nurses, waitresses, and office clerks are examples of pink collar jobs. This term emerged to describe occupations traditionally associated with women's work, which increased notably during and after the World Wars as women entered the workforce in greater numbers.
Though the jobs mentioned require a range of skills and educational backgrounds, they have typically been classified differently from white collar jobs, which generally demand higher levels of education and tend to involve more administrative or managerial tasks, or blue collar jobs, which generally involve manual labor and are more associated with industrial work. Pink collar jobs often entail service-oriented work and support roles such as secretarial duties, nursing, and other care-related professions.