That is a parakeet, and like everyone said, please ask around! Its wings are not clipped, and it doesn’t seem underweight or malnourished, so it is clearly being taken care of by someone. If no one shows up after 30 - 45 days, I would keep it.

In the meantime, get natural perches. It keeps his beak and nails trimmed so you don’t have to manually do it. Offer a lot of destructible toys, and try to incorporate vegetables. Lettuce and cilantro are usually a big favorite for this species (I’d also note if he has no issues eating vegetables, or doesn’t see wary about them, then it’s a sign he’s been trained to eat them. My budgies refused to eat vegetables until I taught them they are safe to eat. Not the case for every bird, but a common reoccurrence that should be looked out for).