Which of the following best describes a lambda function?

A lambda function in Python is defined as an anonymous inline function that is composed of a single expression. This means that it does not need a name to be called; it is defined using the lambda keyword followed by a list of parameters, a colon, and then the expression that is evaluated and returned. The simplicity of lambda functions makes them particularly useful for short, throwaway functions that are not reused elsewhere in the code.

The nature of lambda functions allows them to be used in functional programming paradigms within Python, such as in conjunction with functions like map(), filter(), and sorted() where a small function can be applied to a sequence of elements.

In contrast, other options describe characteristics that do not align with the properties of lambda functions. Named functions can hold multiple statements and are defined using the def keyword. The requirement of a minimum of two parameters is not a defining feature of lambda functions, as they can take any number of parameters (including none) and still fulfill their role. Additionally, while decorators in Python are important for modifying or enhancing functions, they are not solely created by lambda functions, making that description inaccurate as well.