The document provides an introduction to databases. It defines key database concepts including database, database management system (DBMS), table, record, and field. It explains that a database contains organized data stored in tables which contain records made up of related fields. An example is provided of a school database containing data about students, instructors, classes, and student schedules. Advantages of databases include data sharing, improved security and integrity, and reduced redundancy. Disadvantages include complex design, costs, and training needs. Primary keys uniquely identify each record in a table while foreign keys in one table match the primary key of another table to link the tables.