SQL is a language used to read and change information in many databases. It is like writing a clear request to a well-organized filing cabinet.
A shop might use a SQL query to find orders placed this week or to update the delivery address for one order. The database follows the request and returns or changes the matching information.
SQL commands can affect important data, so they should be checked carefully before running—especially when they update or remove records. Different database products can have their own extra features and rules.