认识 (rèn shi) is a verb meaning 'to know (a person)' or 'to be acquainted with.' It combines 认 (rèn), which means 'to recognize' or 'to acknowledge,' and 识 (shi), which means 'to know' or 'to identify.' Together, they emphasize the cognitive act of becoming familiar with someone through meeting or interaction—not just recognizing their face, but knowing who they are and having some personal connection. It's commonly used when talking about people you've met before, especially in social, academic, or work contexts.

This word does not imply deep friendship—just mutual awareness and basic familiarity. It’s neutral in register and appropriate for both formal and informal situations. Unlike 知道 (zhī dào), which means 'to know (a fact),' 认识 specifically refers to interpersonal knowledge. It cannot be used for objects, places, or abstract concepts unless metaphorically extended (e.g., 'knowing' a field of study, though that usage is rare and requires context).