A key aspect of database technology is that security of data that resides on databases is at continual risk from hackers. The landscape of database technology has rapidly changed over the past decade. Database technology has morphed into many variants, which serve to better express how data is managed in the organization. The rapid changes and the increased ways that data is managed creates a swelling risk for database security. In this brief article, please find a summary of a few popular database types, as a prelude to future discussions on database security.