What if Analysis is analyzing the data that we already have available say in a dashboard you want to see the year wise and you have the corresponding year wise values so when the values exceed a threshold you would like to set some alerts.
Predective analysis is analyzing the data using statistical models to predict the data say what will be the profits in 2020 and for we do not have any data so we can only predict it.Data is processed using statistical algorithms,R algorithm etcThere are some statistical tools available using which you can perform this and one of the tool is SAP Predictive Analysis.