A peer-to-peer session typically involves just two users, and does not require the use of the Skype for Business Server conferencing services.
By comparison, a conference typically involves more than two users and requires the use of Skype for Business Server conferencing services.
Is Skype peer to peer?
Skype  is a peer-to-peer (p2p) VoIP client developed by the organization that created Kazaa . Skype allows its users to place voice calls and send text messages to other users of Skype clients. A super node is an ordinary host’s end-point on the Skype network.
Does Skype for business require a server?
All Skype for Business Server servers need Windows PowerShell 3.0 installed.
What can Skype for business do?
Skype for Business, formerly known as Microsoft Lync Server, is a unified communications (UC) platform that integrates common channels of business communication and online meetings, including instant messaging (IM), presence, voice over IP (VoIP), voicemail, file transfers, video conferencing, web conferencing and