平静 (píng jìng) describes a state of calm without disturbance, used for both external scenes (e.g., calm sea) and inner feelings (e.g., calm mood). Unlike 安静 (ān jìng), which focuses on quietness and lack of noise, 平静 emphasizes the absence of agitation or turmoil. It is more concrete than 宁静 (níng jìng), which is more poetic and often describes serene scenery.