What characterizes an anonymous function in JavaScript?

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An anonymous function in JavaScript is defined as a function that does not have a name. This means it is declared without being given an identifier, which distinguishes it from regular functions that are named and can be directly called using their name.

Anonymous functions are often used in places where functions are expected as values, such as when passing functions as arguments to other functions, for example, in functional programming constructs like map, filter, and reduce.

While anonymous functions can accept parameters just like named functions, and they can certainly return values, the defining characteristic is their lack of an assigned name. This allows them to be utilized in a more flexible manner, particularly in callback functions and event handlers.