noun
one-stop service; one-stop source
A service or provider where multiple needs can be met in a single place or through a single process.
このサイトは旅行の予約からホテル、レンタカーまでワンストップサービスを提供している。
This site offers a one-stop service for everything from travel bookings to hotels and rental cars.
Variant with interpuncts; less common but still seen.
Borrowed from English 'one-stop service'.