The term 'Purser' is a job title that encompasses three related roles: CASHIER, STEWARD, and BURSAR. A CASHIER is responsible for handling money, such as collecting payments, issuing receipts, and balancing accounts. A STEWARD is responsible for managing the supplies and provisions on board a ship or aircraft. A BURSAR is responsible for managing the financial affairs of an educational institution. All three roles are important in ensuring the efficient operation of their respective organizations.