Green IT, refers to environmentally sustainable computing or Information Technology. It is a practice of using of computer resources in an energy efficient and Eco friendly way. Green IT starts with manufacturers producing environmentally friendly IT products and encouraging users to consider more environmental friendly options like virtualization, power management and proper e-recycling habits. It primarily consists of following subsectors: 1 Green DataCenters A green data center is a repository for the storage, management, and dissemination of data in which the mechanical, lighting, electrical and computer systems are designed for maximum energy efficiency and minimum environmental impact. 2 Green IT - Consultancy Green IT -consultancy helps increasing lifetime of hardware, reduce Co2/carbon footprint , decreasing energy usage  and to recycle responsibly.It is used in Greener IT Planning & strategising, IT systems Energy auditing & reporting and Greener procurement. 3 Cloud Computing Cloud computing is a general term for anything that involves delivering hosted services over the Internet. These services are broadly divided into three categories: Infrastructure-as-a-Service (IaaS), Platform-as-a-Service (PaaS) and Software-as-a-Service (SaaS). The name cloud computing was inspired by the cloud symbol that's often used to represent the Internet in flowcharts and diagrams. 4 Virtualization Virtualization allow a resource to run multiple instance at the same time. This is achieved by creating a virtual/logical version of something, such as an operating system, a server, a storage device or network resources. 5 Video Conference Video conferencing is a live communication through video and audio connecting remote users with each other as if they were in the same room 6 Energy Saving Desktops / Laptops Energy saving, EcoFriendly Desktops/Laptops which takes less energy as compared to conventional laptops 7 Energy Saving softwares It is a collection of software associated with energy saving. It supports energy saving and energy saving calculation to aid delivery of energy-efficiency services 8 Remote Working infrastructure Remote Working infrastructure is a combination of IT and telecommunication services which enables work from home or any other remote location similar to working from office 9 Energy saving IT peripherals Energy Efficient devices to provide similar computing power and comfort. This includes monitor, printer, speaker, heater, fan...etc