This document discusses different jobs and professions. It defines a job as regular work done to earn money, and a profession as work requiring special training or skills. It then provides brief descriptions of 20 different jobs and professions, including policeman, astronaut, chef, secretary, photographer, detective, doctor, surgeon, architect, fireman, nurse, painter, pilot, plumber, postman, sailor, singer, teacher, waiter, and writer. For each, it lists their key responsibilities or characteristics.