Web development is a broad term for the work involved in developing a web site for the Internet (World Wide Web) or an intranet (a private network).
We have made so far presentation websites, online stores, portals, social networks, video chat sites.
Mobile app development is a term used to denote the act or process by which a mobile app is developed for mobile devices, such as personal digital assistants, enterprise digital assistants or mobile phones.
Web-based real time communications (WebRTC) is a program still growing and developing even today. Though we've come quite a way from the earliest days of this technology, we're still seeing quite a bit of room for new development, even as we're approaching the point where we can call it a mature market.