S stands for security. Find out which certificate ensures the connection safety.
Installing an HTTPS certificate is just a tip of the iceberg. This certificate has a huge number of options that usually are hidden deep inside config files. Actually, these tiny details allow distinguishing a site that can be rendered vulnerable via HTTPS downgrade attack and the one that is really secure.
Read the full article by Gary Williams, a virtualization, storage, and Windows systems administrator, to achieve the highest security.
Not particularly good, actually. Good to spread awaremenss, but the information was mostly spotty with a chance of confusion.