The "next()" and "_next()" methods are frequently utilized in programming languages like Python for the purpose of traversing elements within a collection. The "next()" method is a built-in function that retrieves the subsequent element iterator,thereby advancing the iterator's position. It is commonly employed within loops to iterate through all elements sequentially. Conversely, the "_next()" method, denoted by the underscore prefix, is not a standardized method and may possess specific applications depending on the programming context. It is imperative to refer to relevant documentation or examine the codebase to ascertain its intended functionality and behavior.