A server is a computer program or device that provides a service to another computer program and its user, also known as the client. In a data center, the physical computer that a server program runs on is also frequently referred to as a server. 

top 5 brand in server

IBM , hp , dell, Lenovo , assemble 

server part

server motherboard, server ram , server hdd , server fan, server cpu, server  cabinet, server ssd, workstation, rack ,server software, server hardware manager, server screw, server external attachment, server cables, server supply/ smps, 

top 5 brand in server

IBM , hp , dell, Lenovo , assemble