How to install Office web app for SharePoint 2010

• Office Web Apps is an online version of Microsoft Word, Excel, PowerPoint and OneNote application, which allowing users to access these all Microsoft applications and their respective documents from any Internet connection and any web browsers.
• It is same like Google documents; in which we don’t require to have Microsoft application installed on our local desktop to browse/access any Google documents from internet.
• Once we successfully deploy Office Web Apps on SharePoint farm, it will add the following service applications into farm.

• Word Viewing Service Application
• Excel Calculation Service
• PowerPoint Service Application

Reference Link: http://sharepointgeorge.com/2010/installing-office-web-apps-for-sharepoint-2010/