khost.exe is a secure data delivery application by Kontiki Inc. which delivers data such as images and files to secure servers for sharing. This is a non-essential process.
Disabling or enabling it is down to user preference.
Non-system processes like khost.exe originate from software you installed on your system. Since most applications store data in your system's registry, it is likely that your registry has suffered fragmentation and accumulated invalid entries which can affect your PC's performance. It is recommended that you check your registry to identify slowdown issues