OCSP protocol checks the status of your website identity, which, for different reasons, could be at some point disregarded. Imagine your Passport got stolen, broken or expired and needs a replacement: authorities would be informed so that previous versions aren’t valid for security. This process can take some time… So instead of informing and requesting validation, the Stapling mechanism constantly checks the status of your id, so your identity is always reliable, updated, fast and valid.