relational database

A relational database usually described by using two-dimensional tables consisting of rows and columns which data can be accessed or reassembled in many different ways without having to reorganize the database tables. Hence, a relational database matches data by using common characteristics found within the data set. The resulting groups of data are organized and are much easier for many people to understand. After the original database creation, a new data category can be added without requiring that all existing applications be modified. 
Several terms in the relational database include the following:


Relation   : A table consisting of several columns and several rows.
Attribute  : Column names in a relation
Tuple        : Rows in a relation ,represents an object and information 
                   about that object. Object are typically physical objects or 
                   concepts

Domain     : A valid set of value for one or more attributes

Degree      : The number of attributes in a relation

Cardinality: The number of tuples in a relation

Now, wanna show you  one of example which is how's the term and describing a relational database