In computer programming, a parameter is a variable. A variable is a name given to a data storage location. The parameter variable refers to a piece of input data that is being used in a query. Input data, or parameters, are often called arguments. These arguments are used to define what data should be returned from a query (information retrieval) to a data warehouse. A data warehouse can be as local as a database to as large as the internet.
Ultimately, parameters tell the information retrieval function what data to return to the user.