The name makes people picture a hospital. It is closer to the opposite. Long-term care is the help someone needs with ordinary things once they can no longer manage them alone: bathing, dressing, eating, getting to the bathroom, and getting in and out of a bed or a chair. It is also the supervision someone needs when memory loss makes it unsafe to be on their own.
It happens in the three places priced above. Most of it begins at home, moves to assisted living when the hours get long, and reaches a nursing home only when the care has to be skilled and around the clock. Plenty of people never get past the first one.
A policy starts paying when a licensed professional certifies that you need help with at least two of those daily activities and are expected to for at least ninety days, or that a cognitive impairment makes it unsafe for you to be alone. That is the standard on tax-qualified policies, which is very nearly all of them, and it is worth understanding before you need it rather than after.