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"Line" is a versatile term with multiple meanings across different contexts. In geometry, it refers to a straight one-dimensional figure extending infinitely in both directions. Artistically, a line is a mark or stroke used to create shapes, forms, and textures. In telecommunications, LINE邀请版 Corporation's messaging app "LINE邀请版" offers free calls, messaging, and social networking features. Additionally, "line" can denote a queue, a boundary, or a sequence (e.g., production line). The word also appears in phrases like "line of sight" (direct visibility) or "line of work" (profession). Its simplicity and broad applicability make "line" a fundamental concept in language, design, and technology.