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Databases are one of the major web development solutions to the problem of dealing with large amounts of changing data. Traditional web pages are perfect for presenting static and unchanging information, but as a site grows in scope and complexity creating individual pages for each new product or post rapidly becomes an overwhelming task.
Of all the database formats and languages available, MySQL remains one of the most popular, the “glue” that allows Content Management Systems like WordPress to work. For basic CMS management, a developer might need to know only to know the database name, username and password, but for more ambitious tasks - such as gathering and displaying information in ways never supported by a “stock” CMS install - a deeper understanding is called for.