A query language is a computer programming language used to retrieve information from a database. It is a set of keywords and symbols that are used to construct queries, which are instructions to the database to return specific data.

Query languages can be classified into two main types:

The most common query language is Structured Query Language (SQL), which is a non-procedural query language. SQL is used to interact with relational databases, which are the most common type of database.

Other examples of query languages include:

Query languages are an essential tool for working with databases. They allow users to easily retrieve the data that they need, without having to know how the database is structured or how the data is stored.

Here are some of the benefits of using query languages:

Overall, query languages are a powerful and versatile tool for working with databases. They are essential for anyone who needs to retrieve data from a database, regardless of their level of technical expertise.