A "counter" is like a table but it's a little higher. You use a counter while standing or sitting on a tall stool.
There are counters:
- in a kitchen
- in a store
Something similar to a "counter" but with a different name is a "bar". At some kinds of restaurants, like a diner, you might "sit at the counter", while at other restaurants where alcoholic drinks are served you would "sit at the bar".