noun
Polite and affectionate term for one's own grandmother or an elderly woman addressed as a grandmother figure. Often used by children and in family contexts.
See also: 祖母さん
おばあさんは毎朝公園を散歩します。
My grandmother takes a walk in the park every morning.
おばあさん、このお菓子をどうぞ。
Grandma, please have this sweet.
noun
old woman; elderly lady
Refers to an elderly woman in general, not necessarily a relative. Can be used politely or affectionately, but context matters to avoid sounding patronizing.
See also: 婆さん
道でおばあさんが重い荷物を持っていたので、手伝った。
An old woman was carrying heavy bags on the street, so I helped her.