SSL Certificates are small data files that digitally bind a cryptographic key to an organization's details. When installed on a web server, it activates the padlock and the https protocol and allows secure connections from a web server to a browser. This means your information is secure at all times, and does not get stolen or misused.
How can I know if DailyPetition.com is SSL Secure?
If a site uses SSL, like DailyPetition.com does, to encrypt user data and keep it private, you will see that the URL (the address or the link) of the website begins in the browser with https:// and is usually green.