DV = Domain Validation - all that&#x27;s validated by the certificate authority (CA) is that the person getting the certificate controls the domain<p>OV = Organisation Validation - the CA also checks that the person getting the certificate is the organisation they claim to be (the cert will contain, for example, a company name or number)<p>EV = Extended Validation - the CA does additional checks for authenticity and trustworthiness<p>Typically, sites with EV certificates have the address bar show up green, and the organisation name is visible in it. EV is mostly only used for stuff like online banking. Less important things like Facebook, YouTube and your blog will use cheaper and easier to get DV or OV certificates. Let&#x27;s Encrypt! gives you a DV certificate since domain ownership is the sole thing it can and does validate.