Database technology involves using a database management system to organize, store, and retrieve data from a database. Database security deals with protecting database content, owners, and users from both intentional and unintentional unauthorized access. Access controls are set by authorized database personnel and include controlling who can access what information. Data security also focuses on protecting specific data chunks from corruption, destruction, or unauthorized interpretation. There are two main types of databases: centralized, where all data is stored at a single site, and distributed, where the database is split across multiple computers that may be geographically separated.