They are essentially one-in-the-same. A relational database stores data in a hierarchical structure consisting of “Tables” and “Fields”. Each table supposedly contains data about only one subject (i.e., “Employees”) while each field within the Employees table contains a specific piece of information about that employee (i.e., does he/she pick their nose, shoe size, last name, DOB, etc.).
The hierarchical structure is ALWAYS there and fields in one table then “relate” to fields in a different table (through Key Fields). Database relationships are a little complex to explain in a TechRepublic answer but nearly every database software product is based on the same international database connectivity standard (or ODBC) where mainframe, PC, server, and/or midrange computer databases are built to do the same thing based on the same hierarchical structure and relationship functionality.