Office Web Apps - Services for SharePoint Farm

Office Web Apps is an online version of Microsoft Word, Excel, PowerPoint and OneNote allowing users to access these applications and their respective documents from any Internet connection and using all browser.You can deploy Office Web Apps onto your SharePoint farm providing your users with the same functionality as the online version of Office Web Apps. Deploying Office Web Apps on your SharePoint farms will add the following service applications Word Viewing Service Application Excel Calculation Service PowerPoint Service Application