社会化 is a noun meaning 'socialization' — the process by which individuals learn the norms, values, and behaviors of their society. It's a sociological term, often used in academic or formal contexts (e.g., 社会化过程 'socialization process'). It can also refer to the socializing of industries or services (社会化服务 'socialized services'). The verb form 社会化 (to socialize) is less common and typically appears in technical writing.