后勤 (hòuqín) refers to logistics in the sense of support operations for an organization, especially the military, events, or companies — managing supplies, transport, and services. 物流 (wùliú) is the business/commercial term for logistics, focusing on supply chains and distribution of goods. 后勤 is broader, covering support functions like accommodation and medical care, while 物流 is narrower, about the flow of products.