Warranty is an insurance for an end user against loss of money when submitting a payment on an SSL-secured site.
All SSL Certificates provide your website with an extra assurance that your site is safe to conduct business online. If a Certificate Authority fails to properly validate the information contained in a digital certificate, and this leads to money loss of an end user due to a fraudulent online credit card transaction, in that case the end user can claim for warranty compensation. This Warranty is only payable if the end user is charged fraudulently, the certificate vendor is to provide reimbursement according to its terms of service. Depending on a type of certificate vendors offer different amounts of compensation.