What is the difference between importing users through Active Directory and LDAP?

What is the difference between importing users through Active Directory and LDAP?

Running version: 11.3 Build 11304

I know what the difference is in the two services as a whole, but when reading the descriptions in ServiceDesk Plus, they appear to be almost the same thing.

Can someone enlighten me in what the difference is and or the pro's vs con's of each?

Thanks in advance.