What Is a Database?

A database is a collection of data. The term database usually indicates that the collection of data is stored on a computer.  Database applications are useful to manage the data stored in the computer. The database applications are useful to, how the actual data is stored and retrieved. Some database applications are MySQL, MSSQL and oracle.

College databases is stored and mainated in a server called database server. A database server is a database application built with multiple users in mind. Most of the time when programming PHP you’ll be accessing a database server. Some database servers include PostgreSQL, MySQL, Microsoft’s SQL Server, and the Oracle suite of databases. Some database servers called RDBMS, which is an acronym for relational database management system.
Database servers usually have one or more distinct APIs for programmatically creating, accessing, managing, searching, and replicating the data they hold. It is through the API that you connect to and work with data stored in database servers when using PHP.

There is no requirement that an RDBMS be used to store data. Other data stores can be used such as a flat file or a table known as a hash table. These are perfectly fine for some applications, especially smaller applications; however, for larger applications or applications that require optimal speed for large data stores, an RDBMS is a requirement.