Constant Contact is a marketing automation and email marketing solution.
DatoCMS is a cloud-based headless Content as a service (CaaS) platform created to work with static websites, mobile apps and server-side applications of any kind.
HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
Netlify providers hosting and server-less backend services for web applications and static websites.
YouTube is a video sharing service where users can create their own profile, upload videos, watch, like and comment on other videos.