# Session types
Schlagwörter: Session, Raum, Adhoc-SitzungA distinction is made between two types of online session.
Ad-hoc session
Access is possible for licence holders, contacts and guests (without a previously created account).
The access options are not defined in advance, but are regulated during the session.
Simultaneous access is only possible for guests if group leaders (moderators/hosts) are online and guests are admitted via the waiting room.
In addition, permanent access can be granted to licence holders and contacts. For this group of people, the Ad-hoc session differs only slightly from the meeting.
Meeting with group:
Access is exclusively for licence holders and contacts.
The group is used to define in advance who can attend.
Delayed access is also possible. Participants can also enter the session independently without a group leader.
Note: The "Rooms" edition only supports the "Ad-hoc meeting" session type.