A tool to revoke/cancel your wallet in the case that a password is lost or stolen.
There is no "forgotten password" option. So if you want to retrieve your wallet when your password is lost or stolen, you need to anticipate and save your revocation file in a safe place (computer, hard drive...). The revocation file can be found in the security parameters of your account on Cesium.
More information in the FAQ: What is the revocation file purpose?