What is a wave analytic app/ application in Salesforce?

Sales Wave Analytics, allows sales teams to manage forecasts, pipelines, team performance and more, in order to accelerate business growth. The app is also designed to promote greater productivity by making the Salesforce app even more tightly integrated with everyday sales tasks, such as using Salesforce 1 to manage customer contacts. The Wave app works natively in Salesforce 1, a customer relationship management CRM app in which salespeople are already working, so they don’t have to click between multiple applications to analyze data and then take action.