What is Windows Powershell? (42 of 285 technotes for 2015)

• Shell developed by Microsoft for the purpose of Task Automation and Configuration Management
  
• First released in 2006
• Based on .Net Framwork
• Includes CLI (Command Line Interface) and scripting language
• Windows Powershell ISE (Integrated Scripting Environment) - it is a Graphical User Interface (GUI)

Things that you can do with Power Shell

• Display all the USB devices
  
• Set time consuming task in the background
• Identify and kill processes
• Filter specific info about Computers in the network and export in html
• Simplify and Automate tedious tasks, repetitive tasks
• Powershell is very helpful for Network Admins - working with Active Directory
• It has hundreds of customizable commands called “cmdlets”.

References: 

http://www.7tutorials.com/simple-questions-what-powershell-what-can-you-do-it