Define 'function overloading.'

Function overloading refers to the ability to have multiple functions with the same name in a programming language, but with different parameter types or a different number of parameters. This allows developers to create more flexible and intuitive code, as the same function name can operate on different types of inputs or handle various scenarios based on the number of arguments passed to it.

For example, consider a function named add. This function could be overloaded to handle different data types such as integers, floats, or even strings (for concatenation). The specific implementation of the function would depend on the type or number of parameters supplied, making the code more organized and reducing the need for multiple function names that perform similar tasks.

This concept enhances code readability and maintainability, enabling developers to present a clear and concise API while supporting various use cases within a single function name. Other choices do not encapsulate the definition of function overloading accurately. Removing redundant functions, increasing security, or modifying functions for performance does not involve the aspect of using the same function name for varied parameters.