草坪 (cǎo píng) refers specifically to a cultivated, often mown lawn in a garden, park, or yard — it implies a maintained grassy area. This contrasts with 草地 (cǎo dì), which is a broader term for any grassy land (a meadow, field, or pasture, natural or not). 操场 (cāo chǎng) is a playground or sports field that may be grass, dirt, or synthetic — its primary use is athletic activities, not a decorative lawn.