'Hé yǐng' literally means 'together image' — 'hé' (合) conveys unity, joining, or combining, while 'yǐng' (影) means 'shadow' or 'image', and in modern usage refers to a photograph. Together, the term specifically denotes a photo taken with two or more people intentionally posed together, emphasizing shared presence and mutual participation. It’s not just any group picture; it carries a sense of occasion, intentionality, and social connection.

This word is commonly used in everyday contexts like family gatherings, school trips, weddings, office events, or tourist visits — anywhere people pause to commemorate time spent together. Unlike generic terms for photos (e.g., 照片), 合影 implies active collaboration: everyone arranges themselves, smiles, and faces the camera as a unit. It often appears in invitations ('咱们一起合影吧！'), captions under photos, or announcements at events. The verb form 合影 (to take a group photo) is also frequently used, though the noun usage is more common in written and spoken descriptions.