1, with different functions. Bench is a kind of long strip furniture without backrest and armrest, which can be used by people. Suitable for short-term use or simple labor or work. A chair is a kind of furniture with a backrest and handrails for people to sit on, which is suitable for sitting for a long time.
2, the comfort is different. The bench has no backrest and armrests, nor does it support the spine and arms. You need to balance yourself, so it's easy to feel tired. The backrest and armrest of the chair can support the spine and arms, so that you can have a comfortable sitting position, relax your body and reduce fatigue.