SSL Certificates enable data encryption on the internet and allows data to be securely transmitted from a web server to a browser. With a SSL, your website can use the https protocol and it will display a lock to the end users web browsers' to indicate that the connection is secure.
Although all SSL certificates use similar methods to protect and validate your data, the level of trust they provide varies. Standard SSL (Domain Validated) certificates are the most common type of SSLs. OV and EV certificates also authenticate the identity of the company or organization, providing more trust to the end users.
EV Certificates offer the highest level of validation and trust, and will show the name of the company or organization in the URL address bar. This is an instant sign that helps the visitors know extra steps were made to increase the security on the website. That is why the biggest companies and organizations choose EV certificates.