This document discusses green computing or green IT, which aims to maximize energy efficiency during a product's lifetime through approaches like virtualization, power management, and proper recycling. It describes how virtualization allows combining multiple physical systems into virtual machines on a single powerful system to reduce power usage. Using LCD/LED displays and terminal servers connected to thin clients also decreases energy costs. Implementing power management at the administrative level allows automatically turning off hardware like monitors during inactivity to save energy. Data centers and their high energy usage are mentioned as areas green IT approaches could be applied through virtualization and power usage effectiveness methods.