noun
A long seat for multiple people, typically found in parks, stations, or public spaces.
公園のベンチでお弁当を食べた。
I ate my lunch on a bench in the park.
駅のベンチで電車を待つ。
I wait for the train on a bench at the station.
椅子 is a general term for a chair, typically for one person, while ベンチ refers specifically to a long seat for multiple people.
Borrowed from English 'bench'.