Domain Validation (DV)
Domain Validation SSL Certificates take the least amount of time to issue, typically just a few minutes or at most a day. The reason for this is simple: they offer the least authentication.
In order to get a DV cert one needs only prove they own the registered domain. This can usually be done via email, or sometimes file-based authentication – where the Certificate Authority gives you a file to upload on your site and then comes through and checks it – either way, it takes just minutes to validate and then the certificate can be issued.
This makes DV certs an ideal solution for blogs or personal sites, or if you need to encrypt in a pinch while waiting for a higher value certificate to be issued. But DV certificates' lack of authentication makes them a poor choice for e-commerce sites or businesses looking to leverage SSL to help establish their reputation. It also makes them an ideal choice for cybercriminals looking to scam unsuspecting internet users.