The Hardware of a web server will be the same as any other server
Processors
Memory (RAM)
Hard Drives
Power Supplies
Network Card(s)
the server will be set up with IIS - internet Information Service which allows website to be hosted or Apache if using Linux or other Web service software
generally a web server hosting loads of site will have lots of hard drive space and RAM and powerful processors for running a couple site done need anything really fancy
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