贴纸 (tiē zhǐ) literally means 'stick paper' — 贴 (tiē) means 'to stick, to paste', and 纸 (zhǐ) means 'paper'. Together, they refer to adhesive-backed paper or plastic sheets designed to be stuck onto surfaces for decoration, labeling, or identification. These are commonly used by children in school projects, on notebooks and laptops, or in offices for organizing documents.

Unlike traditional glue-based paper attachments, 贴纸 are pre-coated with removable or permanent adhesive and often feature colorful designs, cartoon characters, or functional symbols. They’re widely available in stationery stores and online, and come in many sizes and materials — from matte paper to glossy vinyl. In daily life, people say '贴一张贴纸' (stick a sticker) or '收集贴纸' (collect stickers), especially among kids and hobbyists.