HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
React is an open-source JavaScript library for building user interfaces or UI components.
Twitter is a 'microblogging' system that allows you to send and receive short posts called tweets.
Vercel is a cloud platform for static frontends and serverless functions.
YouTube is a video sharing service where users can create their own profile, upload videos, watch, like and comment on other videos.