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 (over port 443) and allows secure connections from a web server to a browser. It also provides a secure communications channel for email, messaging and digital signing when installed to those services.
All TurnKey SSL certificates are fully trusted by all devices and browsers; however, each certificate type will contain a different amount of information about the organization you are connecting to and therefore be trusted accordingly by your users. For example, an EV certificate will contain the most amount of verified information and display the "green bar" in the browser and is universally considered to be the highest trusted certificate available. An AlphaSSL on the other hand will simply display that
All TurnKey SSL certificates are fully trusted by all devices and browsers and will display the padlock symbol in the browser. The purchase of an ExtendedSSL is required to obtain the "green bar" in the browser.