Oh I see, thanks for the clarification. I'm from Switzerland, some households have separate dedicated Bidets.
An addon bidet I have personally never seen here. But there are fancy toilets that already included a water jet function. We usually call those Japanese Toilets though, at least that's how I learned it. It's also common to use flushable wet wipes in households that have neither.

in the states they are called bidets, the technical term is "washlet"

There's another kind of bidet?