1. What is SAS
SAS or Statistical Analysis System, is a software suite developed by the SAS Instituted for advanced analytics, multivariate analyses, business intelligence, data management, and predictive analytics. Review of statistical packages concluded that SAS provides researchers with extraordinary range of data analysis and data management tasks capabilities, however it can be difficult to learn when compared to SPSS and Stata (although these have fewer analytic abilities without user add-ons).
This software is commonly used among researchers working with very large data sets because it is a powerful software suite that allows you to do almost anything you like with your data.