ELI5: Explain Like I'm 5

HTTP Strict Transport Security

HTTP Strict Transport Security (HSTS) is like a security guard for your website. It helps stop hackers from being able to access your website by making sure that all communication between your website and its visitors happens over a secure connection. Whenever someone visits your website, the HSTS guard first checks to make sure the connection is secure by looking for special “locks”. If the locks are in place, then HSTS lets the visitor proceed to your website. If the locks are not there, then HSTS stops the visitor from entering your website until they can make a secure connection.