'售后' (shòu hòu) is a compound noun meaning 'after-sales' — specifically referring to services or support provided by a seller or manufacturer after a product has been purchased. The first character 售 (shòu) means 'to sell', and the second character 后 (hòu) means 'after' or 'behind'; together, they literally mean 'after selling'. This term is almost exclusively used in business and consumer contexts, especially in phrases like 售后服务 (shòu hòu fú wù, 'after-sales service') or 售后政策 (shòu hòu zhèng cè, 'after-sales policy').

It functions as a noun modifier, typically preceding another noun — you wouldn’t say *我买了售后; instead, you’d say 我联系了售后服务 (I contacted after-sales service). It’s formal but common in everyday commerce, from electronics stores to online platforms like Taobao or JD.com. While not tied to any physical object, it strongly implies customer care, warranty handling, returns, repairs, or technical assistance.