What does underscore mean in web address?

In a web address (URL), an underscore (_) is a character that can be used to separate Words or elements within a segment of the URL. While it is valid and can help improve readability, it is less commonly used than hyphens (-) for this purpose. Search engines generally treat underscores differently than hyphens, often considering Words separated by underscores as a single term, which can affect SEO. Therefore, it's typically recommended to use hyphens for better visibility and indexing.