What is the rack server/rack-mounted server?

6 steps for setting up a server room for your small business

Mounting Server in Rack — Server Rack Setup Guide

HP Rack Server - Enterprise-Grade HP Proliant Rack Mount Server

High Performance 1U Rack Mount Server - Stealth Model: SR-1515

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Rack Mount UPS - How to Choose for Servers and Home Network?

Unveiling the Other Side: The Disadvantages of Rack Mount Servers Blog

storage - Economical way to get many harddrives into rack mount

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This 15U server or network rack cabinet lets you mount your EIA-310 compliant equipment to the wall, in a secure enclosure that has a hinged rear door

4-Post 15U Wall Mount Network Cabinet with 1U Shelf, 19 Hinged Wall-Mounted Server Rack for Data / AV / Electronics / Computer Equipment, Flexible

Network & Server Racks, Rack Mount UPS