A database is an organized collection of data, generally stored and accessed electronically from a computer system. The databases that are more complex, are often developed using formal design and modeling techniques. In other words, databases are the systems that store all the information that an application (simple or complex) needs in order to function. Where does Twitter store all the tweets? In a database.

via Francesco Lelli at the following url:

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This is a small description of the picture: A database is an organized collection of data, generally stored and accessed electronically from a computer system. The databases that are more complex, are often developed using formal design and modeling techniques. In other words, databases are the systems that store all the information that an application (simple or complex) needs in order to function. Where does Twitter store all the tweets? In a database.