A managed host can be described as a company who takes care of the support, management, administration, and setup of either an application or a server (or sometimes both).
Management services differ per host, but for the most part, they come with OS patching and updates, 24/7 support, hardware and network infrastructure management, fundamental security measures (spam and virus protection, for instance), and remediation and tracking of things that can negatively impact a server’s performance.
It is the job of a managed host to make sure that the applications and websites of clients remain running all day and night. Such guarantees tend to be listed in Service Level Agreements, which states how a managed host will rectify issues if a server goes down.
Hosting management can be outsourced in order to bypass the need to have experts or infrastructure in-house. Such outsourcing would enhance scalability more effectively and efficiently.