Hosting add-on is a set of hosting resources. Hosting addons allow you to extend quotas, domains, dedicated ips, ssl certificate, backup & restore website and much more.
A dedicated IP (Internet Protocol) is a unique Internet address dedicated exclusively to a single hosting account. Dedicated IP helps your website in better ranking in all search engines.
SSL (Secure Sockets Layer) is the standard security technology for establishing an encrypted link between a web server and a browser. This link ensures that all data passed between the web server and browsers remain private and integral.
Domain privacy or WHOIS protection (different registrars sometimes refer to it by different names) hides the domain registrant's personal information from the public WHOIS database. WHOIS is an organization that manages all data regarding domain registration.