Webinars or Web Conferencing
This refers to a service that allows conferencing events to be shared with remote locations. Most vendors also provide either a recorded copy of an event or a means for a subscriber to record an event. The service allows information to be shared simultaneously, across geographically dispersed locations in nearly real-time. Applications for web conferencing include meetings, training events, lectures, or short presentations from any computer.

A participant can be either an individual person or a group. System requirements that allow individuals within a group to participate as individuals (e.g. when an audience participant asks a question) depend on the size of the group. Handling such requirements is often the responsibility of the group. In general, system requirements depend on the vendor. The service is made possible by Internet technologies, particularly on IP/TCP connections.
Teleseminars are used to provide information, training, or promote or sell products to group of people interested in a particular topic. They are similar to traditional seminars, in content and purpose, but they are given over a teleconference or bridgeline rather than at a specific location.

It is an emerging way to communicate, provide teletraining, and conduct business without the cost of travel. The host of the teleseminar will schedule a specific time and date in advance to communicate with his/her audience. The audience can vary in size from a few callers to 1,000 participants depending on the capacity of the bridgeline used and the popularity of the topic being discussed.
A podcast (or non-streamed webcast) is a series of digital media files (either audio or video) that are released episodically and often downloaded through web syndication. The word replaced webcast in common vernacular due to the fame of the iPod and its role in the rising popularity and innovation of web feeds.

The mode of delivery differentiates podcasting from other means of accessing media files over the Internet, such as direct download, or streamed webcasting.