File - is a collection of related structured data, Primary key - the keys that are unique from others., Foriegn key - a field in one table that uniquely identifies a row of another table. Foreign key is defined in a second table but it refers to the primary key in the first table., Key field - a field in a record that holds the unique data that identifies that record from all the other records in the file or database., Flat file database - is a collection of data held in a single table, meaning data can only be viewed in a limited way., Relational database - Data may be held in a number of tables where links (or relationships) are created to connect the data in different tables to each other.,

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