The hardware used for your server is usually more powerful than your other desktop computers.
To get started with ArcGIS Server, you need to provide hardware, software and data, then you can configure GIS web services, and eventually you can use different types of applications to use your services. This software will open your GIS to teleport, smartphones, laptops, desktop workstations and any other device that can be connected to web services. This is done through web services, which allow a powerful server computer to process information requests sent by other devices.
ArcGIS Server is a software that makes your geographic information available to others in the organization and optionally to anyone connected to the Internet.