What is underscore definition?

An underscore definition is a naming convention used in programming languages to indicate that a function, variable, or method is intended to be used as an internal or private element within a program or module. The underscore character is typically added as a prefix or suffix to the name of a function or variable. This helps programmers easily differentiate between public and private elements, and also helps to prevent naming conflicts between variables and functions with similar names. In Python, for example, underscored variables and functions are often used to indicate internal implementation details or non-public APIs. However, it is important to note that this convention is not enforced by the language itself and can vary between programming languages and even between programmers within the same language.