Common features found in  Web Conferencing software  may be:

• Presentations .
• Live video streaming between participants (via webcam or digital video camera)
• VoIP, or other method of talking to each other (using the computer, phone, etc.)
• Web tours - where URLs, data from forms, cookies, scripts and session data can be pushed to other participants enabling them to be pushed though web based logons, clicks, etc.
• Recording of meetings and sessions.
• Whiteboard with annotation (allowing the presenter and/or attendees to highlight or mark items on the slide presentation. Or, simply make notes on a blank whiteboard.)
• Text Chat- For live question and answer sessions, limited to the people connected to the meeting. Text chat may be public (for all participants) or private (between 2 participants).
• Polls and surveys (allows the presenter to conduct questions with multiple choice answers directed to the audience)
• Screen sharing/desktop sharing/application sharing (where participants can view anything the presenter currently has shown on their screen. Some screen sharing applications allow for remote desktop control, allowing participants to manipulate the presenters screen, although this is not widely used.)