AWS ELB is a network load balancer service provided by Amazon Web Services for distributing traffic across multiple targets, such as Amazon EC2 instances, containers, IP addresses, and Lambda functions.
HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
PerimeterX is a provider of scalable, behavior-based threat protection technology for the web, cloud, and mobile.
Varnish is a reverse caching proxy.