A database is a repository for holding data in a manner that allows it to be easily retrieved and categorized. Web databases generally use some form of SQL (Structured Query Language) with PHP (Php: Hypertext Preprocessor) to query databases and display information from database for a user on their browser.

A SQL database can hold thousands of entries, and is often used in applications such as online stores, where product information must be stored in an easily-retrievable manner. PHP is used on web pages to query the SQL database and retrieve data based on user inputs (such as in search boxes).

PHP is free to use, and certain forms of SQL are free to use as well (MySQL is one of the most common and popular).

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