Yes coffee grounds are edible and you can eat coffee grounds if you want to eat them.
Although coffee grounds are not very tasty or very easy to eat so I would not recommend it.
I hate getting coffee grounds in my mouth when I have coffee grounds get into my coffee cup so I would never want to eat coffee grounds although you can do so.
The coffee grounds are supposed to be healthy for you though because they also still contain caffeine, antioxidants, and dietary fiber.
Even after they've been brewed the coffee grounds are still healthy for you to consume but they are not the tastiest.