Late on a Sunday, when there's nowhere else to sit and someone's chopping something while someone else is just leaning on the counter talking, is when a bar stool proves its worth. It's the kitchen version of a doorway conversation, except with somewhere to put your drink down. Kitchen islands and breakfast bars created a whole category of standing around, and stools are the only thing that fixes it without pulling chairs across the room.
If you own none, start with a plain wooden or metal counter stool with a footrest and no arms, nothing that swivels or adjusts yet. You want the cheapest possible way to find out whether your household actually sits there or just talks there for ninety seconds and wanders off. Once you know that, upgrade. A padded seat and a swivel base cost more but get used daily instead of becoming a place to hang a tea towel.
Measuring matters more than people think, and almost everyone gets it wrong. You want eleven inches between the top of the seat and the underside of the counter, nine if the stool has arms. Measure your actual counter height first, standard is thirty six inches but older houses and rental kitchens wander all over the place, so a stool built for a thirty inch bar will leave you eating with your chin at counter level if your counter is forty. Allow at least twenty four inches of width per person side to side, more if anyone's elbows are involved, and don't buy four stools for a run of counter that comfortably fits three, you'll just be knocking knees all evening.
A heavy carved wood stool looks wrong next to a sleek handleless kitchen, and a chrome swivel stool looks wrong in a cottage with a farmhouse table two feet away, the mismatch reads instantly even if you can't say why. They also don't belong crammed against a dining table as backup seating, the seat height throws the whole table off and someone always ends up eating with their plate near their chest.
In an ordinary kitchen, they sit well against an island with open shelving underneath, a runner rug in front of the sink, and pendant lighting that isn't trying too hard. Next to the stools themselves, I'd put a low shelf or a small side table within reach, because someone's phone, keys or glass of wine will land somewhere, and you'd rather it wasn't on the stool next to you.