Status code 300 is a rarely used code in the world of HTTP requests and responses. It indicates a situation where the server has multiple possible responses for a given request, and the user agent (usually a web browser) needs to choose which one is most appropriate.
Imagine you're at a restaurant and you order a hamburger. The waiter comes back and says "We have a regular hamburger and a cheeseburger. Which would you like?" In HTTP terms, the waiter is the server, your order is the request, and the two types of hamburgers are the multiple responses.
In an ideal world, the server would provide additional information to help the user agent pick the right response. This might involve sending a "Location" header that suggests a preferred choice. However, the 300 status code itself doesn't provide any guidance on how to choose. Because of this ambiguity, web developers tend to avoid using code 300 in favor of more specific redirection codes like 301 (moved permanently) or 302 (found).