Domain Validated Certificate offer a basic level of trust.
The CA checks to make sure that the applicant actually has the right to the specified domain name.
No company information is vetted, and clicking on the secure site seal displays no information other than encryption information.
A DV certificate is usually issued within a matter of hours, and can sometimes be issued immediately.

Organisation Validated Certificates offer a good level of trust. The issuing CA checks to make sure that the applicant
actually has the right to the specific domain name, as well as a basic investigation of the requesting organization.
The results of this investigation are displayed to customers when the secure site seal is clicked on.
This provides enhanced visibility of who is behind the site, which in turn increases trust.
An OV certificate typically takes about two business days to issue.

Extended Validation Certificates offer the highest level of trust.
The issuing Certificate Authority performs a very thorough investigation of the requesting organization.
The required steps include verifying the legal, physical, and operational existing of the requesting entity; verifying that the identity of the requesting entity matches official records; verifying that the requesting entity has the exclusive right to use the domain specified in the EV certificate; and verifying that the entity has properly authorized the issuance of the EV certificate.
An EV certificate typically takes about ten business days to issue.