Databases are used everywhere and SQL is the common form of database.
They are used by browsers, for local storage, to store interesting data like URL histories (using SQLLite).
They are used by companies on their servers to hold customer information, order information, product information, employee information, etc..
They are used on the web to dynamically create web pages on the fly.
They are even used in computer games to store in game data.
Of course there are many other data structures in use, and may other data base languages. SQL is just the one you come across most often.
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