A relational database is a means of storing, manipulating, and analysing structured data. Databases store data in tables, which are a series of records. Each row of a database table contains one record, with information stored in multiple fields (the columns of the table). Relational databases are useful when working with structured data, especially where sorting and filtering are necessary.
To read more about how to design a database, sort data and create forms, download the article (as a PDF) from the link below.