Apache is a free and open-source cross-platform web server software.
HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
Jekyll is a blog-aware, static site generator for personal, project, or organisation sites.
Open Graph is a protocol that is used to integrate any web page into the social graph.
Unix is a family of multitasking, multiuser computer operating systems.
WhatsApp Business is a free to download app available on Android and iPhone using which businesses can connect with their customers.