What is SQL used for?

SQL, which stands for Structured Query Language, is primarily used to query and manipulate databases. This language provides a standardized way to interact with relational database management systems, allowing users to perform operations such as retrieving data (queries), inserting new data, updating existing data, and deleting data. SQL has various commands like SELECT, INSERT, UPDATE, and DELETE that facilitate these tasks.

These operations enable efficient management and organization of data within a database, making SQL integral to anyone working with databases, whether for application development, data analysis, or database management. In contrast, creating graphical user interfaces, developing operating systems, or programming internet applications falls under different sets of technologies and programming languages, illustrating why the other options do not accurately represent SQL's primary purpose.