An HTTP 403 Error, also known as "Forbidden," occurs when a user tries to access a webpage or resource that they do not have permission to view. This error indicates that the server understands the request but refuses to authorize it. Common reasons for this error include insufficient user permissions or restrictions set by the website owner. When encountering a 403 Error, users may see a message stating that access is denied. This can happen on various platforms, including websites, servers, and applications. To resolve the issue, users may need to check their permissions or contact the site administrator for assistance.