In general, web conferencing is made possible by Internet technologies, particularly on TCP/IP connections. Services may allow real-time point-to-point communications as well as multicast communications from one sender to many receivers. It offers data streams of text-based messages, voice and video chat to be shared simultaneously, across geographically dispersed locations. Applications for web conferencing include meetings, training events, lectures, or presentations from a web-connected computer to other web-connected computers.
Real-time text chat facilities such as IRC appeared in the late 1980s. Web-based chat and instant messaging software appeared in the mid-1990s. The PLATO computer learning system allowed students to collaborate on networked computers to accomplish learning tasks as early as the 1960s, but the early networking was not accomplished via the World Wide Web and PLATO's collaborative goals were not consistent with the presenter-audience dynamic typical of web conferencing systems.[8] PLATO II, in 1961, featured two users at once.[9]
Your product may be a physical item, a piece of software or even a kind of service. Webinars allow you to give real-time demonstrations and presentations with various features to promote vividly to the audience. For example, ezTalks Webinar can help to show the product with ultra-high-definition video and crystal-clear audio quality. For another example, ezTalks helps to share your latest presentations, documents or video clips and get everyone on the same page flexibly. What's more, the real users' questions on the product can be answered online quickly and the webinar Polls & Survey function may drive you better know about market demand, which can build or improve the relationships between the seller and customers. This can definitely boost your product sales. More importantly, many customers may be willing to pay to attend the webinar after you can get more followers and establish yourself an as authority in your industry, as they believe they can receive exclusive content and educational materials. 
The term "webcast" derives from its original similarity to a radio or television broadcast. Early usage referred purely to transmission and consumption of streaming audio and video via the World Wide Web. Over time, webcast software vendors have added many of the same functional capabilities found in webinar software, blurring the distinction between the two terms. Webcasts are now likely to allow audience response to polls, text communication with presenters or other audience members, and other two-way communications that complement the consumption of the streamed audio/video content.

For the example above, this might sound like, “If you’re tired of people asking to pass you on the golf course, this product is for you. Imagine how it will feel when you start winning games, and accepting business golf match invitations, because you’re confident in your newfound golf game. This program can help you make steady improvement that you’ll begin seeing within a couple of rounds.”
In 1996, PlaceWare was founded as a spinoff from Xerox PARC. In November of that year, PlaceWare Auditorium was described in a public talk at Stanford University as allowing "one or more people to give an interactive, online, multimedia presentation via the Web to hundreds or thousands of simultaneous attendees; the presentation can include slides (made in PowerPoint or any GIF-image editor), live annotation on the slide images, real-time polls of the audience, live audio from the presenter and those asking questions, private text and audio conversations in the auditorium's "rows", and other features."[18] PlaceWare Auditorium was formally announced in March 1997 at a price of $150 per simultaneous user.[19]
In 1992, InSoft Inc. launched Communique, a software-based Unix teleconferencing product for workstations that enabled video/audio/data conferencing. Communique supported as many as 10 users, and included revolutionary features such as application sharing, audio controls, text, graphics, and whiteboarding which allowed networked users to share and manipulate graphic objects and files using simple paint tools.[10][11]
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