Web seminars, also called webinars, allow large group presentations, training classes, and meetings to take place online. They reduce costs and travel time compared to in-person events while maintaining interactivity. Webinars are easy to set up using conferencing software and invitations with links. They differ from web conferences in supporting more attendees in a "one-to-many" format where the presenter shares their screen and controls the audio while attendees can ask questions.