What is error 503?

Error 503 signifies that the server is temporarily unable to handle requests, commonly due to overload or maintenance. It's displayed when accessing a website experiencing such issues, often with a message like "Service Unavailable." Causes include server overload, maintenance, resource limitations, or configuration errors. Users must wait until the server can resume normal operation, as the error is usually temporary. It's crucial for website administrators or hosting providers to address the underlying issue promptly to restore service.