Using the SSL checker is particularly useful if you run a website that requires the exchange of sensitive data with your clients. This kind of data exchange should always be secured by an SSL certificate , as third parties might otherwise be able to gain access to the information. If you run an online store where the checkout process requires the entering of a delivery address and payment details by the customer, or you host a contact form on your website where interested parties can enter their name and email address, an SSL certificate is vital. If SSL is installed, you can use the SSL Certificate Checker to determine whether there are any potential security gaps which could endanger the data exchange. Over the last few years serious security leaks have been discovered repeatedly, particularly with older SSL versions and implementations. Use the SSL tester from IONOS to avoid potential gaps in your SSL certificate.