A disposable diaper, or cloth with plastic pants... used for babies, toddlers, children, adults, old people, everyone! Can be for medical reasons, for convenience, could be a fetish for some people. It allows them to go #1 and #2 , and contains there wet and messy.
Other slang names: didee(s), dipee(s),
tinkle-poopers, crinkle pants, baby pants, pampers (a general term, not just the company name.) , and os many more cute ones :)
I like to wear them at night so I don't have to get up. I don't know about you, but I go to bed to sleep, not to get up to go to the bathroom. Plus for people who like to regress for security, and comfort, diapers are a significant part of that. I use for conveince, and for regression. People need to lighten up about diapers. They are a Godsend.