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This is one from when acronyms were amusing, not the worrying list of unknowns they are today.
Create Read Update Delete.
These four words describe all the possible operations a database engine performs on the data it stores.
They are also the exact same four words that act as commands to perform those operations on data held within a database.
When typed in to any program that allows you to type in SQL.
SQL can be typed into a number of tools such as ISQL or WinSQL. It allows you to perform the essentail business operations carried out by millions of people e.g. filling out or updating an online form.