职业 (zhí yè) is a noun meaning 'occupation, profession' — the general term for the job or career you are trained for and do for a living. It differs from 专业 (zhuān yè), which is your academic 'major' or specialized field of study, and from 事业 (shì yè), which emphasizes a 'career' or 'cause' with a sense of long-term dedication. 职位 (zhí wèi) is more specific, referring to a particular 'position' or 'post' within an organization.