svchost.exe (Service Host) is a normal process used for running services (background programs) on Windows. You can use tools like Process Explorer to determine what executables are being ran by the Service Host process. Without further information as to what is being ran by the Service Host it is impossible to provide you with additional recommendations, and JL117748's "answer" is woefully uninformed in regards to the basics of the Windows operating system. You can download a copy of Process Explorer here.
I should have been more detailed and addressed how to specifically see which services are being ran by Service Host, since by saying executable gave the impression of only child processes as brought up by dave_thompson_085. If you right click on the svchost.exe process in Process Explorer, and select Properties, then click on the Services tab as can be seen in the screenshot below. Assuming the services arent needed/required by the operating system, they can be disabled by opening the Computer Management MMC (in Administrative Tools, or right clicking the Start Menu/Windows Logo button), selecting Services underneath Services And Applications, then double clicking the relevant service, clicking the stop button and then changing the Startup Type to Disabled.