This tutorial on Modern Database Systems (MDS) is targeted at a broad set of database systems and applications people. It is intended to let the attendees better appreciate what is really behind the covers of many of the modern database systems (e.g., NoSQL and NewSQL systems), going beyond the hype associated with these open source, commercial and/or research systems. The capabilities and limitations of such systems will be addressed. Modern extensions to decades old relational DBMSs like DB2 and SQL Server will also be described. Some application case studies will also be presented.