分类 (fēn lèi) literally means 'to divide + type/genre' — combining 分 (to separate, divide) and 类 (kind, category). As a verb, it refers to the action of grouping items based on shared characteristics; as a noun, it means 'categorization' or 'classification'. It’s commonly used in academic, scientific, administrative, and everyday contexts — for example, sorting animals by biological traits, organizing library books, or filing digital documents.

This word implies systematic, logical grouping rather than casual sorting. It often appears with objects like 数据 (data), 垃圾 (garbage), 动物 (animals), or 图书 (books), and frequently follows verbs like 进行 (to carry out) or 需要 (to require). While it can be used in spoken language, it carries a slightly formal or technical tone compared to simpler alternatives like 分 (fēn) or 归类 (guī lèi).