There's different grades of validation, some of which audit your organization's legal structure to make sure you are actually a legitimate company. Let's Encryp

There's different grades of validation, some of which audit your organization's legal structure to make sure you are actually a legitimate company. Let's Encrypt does domain validation, which validates that the entity it is issuing a certificate for has control of the domain name. In practice, I doubt most people that use web browsers actually know the difference. They just see a green lock and assume everything is good to go.