Skype for Business Web App is a browser-based meeting client that you use to join Skype for Business meetings. You can’t schedule a meeting from Skype for Business Web App, but you can join a meeting that was scheduled using either Microsoft Outlook or Skype for Business Web Scheduler.
Tip: If your organization is using Microsoft Lync 2010 and you want information about using Lync Web App for 2010, see Quick Start: Participate in online meetings with Lync Web App.
You don't need to download or install any apps to join a meeting with Skype for Business Web App. Just select Join Skype Meeting in the email or calendar meeting request you received. If the computer you're using doesn't have Skype for Business installed, a browser window opens and you can join the meeting.
Comparison with other Skype for Business clients
Skype for Business Web App provides HD video conferencing, IM in meetings, high-fidelity desktop, application, and presentation viewing, desktop sharing, whiteboard, lobby, and presenter access controls. In addition, Skype for Business Web App now includes PC-based audio and video. It doesn’t offer any other Skype for Business features, such as presence or contact information. For more information, see Skype for Business Online Service Description and Client comparison tables for Skype for Business Server 2015.