If you view this website on your computer, there should be a padlock symbol next to the website address, like this:
If you click on that padlock, you should see an explanation like this:
The Tennis Club website uses Essential SSL from Comodo. “Comodo Essential SSL Certificates support 128-bit encryption levels and are signed with 2048-bit signatures in compliance with the US Government’s National Institute for Standards and Technology’s post recommendations for SSL root key strength.”
According to the FTC, SSL “ensures users are visiting a legitimate website and not an imposter. It also provides encrypted communications to protect personal information sent between the website and a user’s computer, as well as other website security safeguards.”