There are three types of SSL Certificate available today; Extended Validation (EV SSL), Organization Validated (OV SSL) and Domain Validated (DV SSL). The encryption levels are the same for each certificate, what differs is the vetting and verification processes needed to obtain the certificate. Over the last few years the number of organizations using SSL Certificates has increased dramatically. The applications for which SSL is being used have also expanded.
you might need SSL for privacy in communication (to ensure you are not being snooped on),
or you might wish to prove you can trust who you are talking to (identity in private communication).
With encryption, you are able to hide communications from a hacker but you cannot stop them from intercepting communications and posing as your website to steal information from your customers. As people move away from brick and mortar stores and increase their online shopping and banking habits, consumers have to be able to trust they are visiting the true website of the store they are shopping on. This is more difficult to prove online. You can prove your identity by having an external third-party (like GlobalSign) vet your personal and company information. Based on this verification or vetting procedure, SSL Certificates can be broken down into three categories.