This document provides an overview of databases and database management systems (DBMS). It defines what a database is (a systematic collection of data) and some common database applications like banking, universities, online shopping, and more. It describes what a DBMS is and its purpose of interacting with users and the database for storage, analysis, and access control. The document outlines database languages like SQL and database structure involving tables, rows, and columns. It discusses database components like schemas, tables, columns and rows. Finally, it compares key differences between DBMS and file systems, noting that DBMS allows flexible querying across related data tables while preventing redundancy and restricting unauthorized access.