This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
1. an arrangement or classification of things 2. an implementation, or putting into use, of something
"Deployment" in simple terms , putting your .war file into servlet container, so that container read its "Deployment Descriptor" (web.xml) and instantiate the parameters and servelts to process request to deployed web apps.
I may not be able to explain you fully , any fellow ranchers will explain you in detail.