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This Barchelor’s thesis deals with the design and development of a Web Chat application using modern Web Development technologies. The material of the paper consists of four parts. Initially, there is an introduction to the concept of communication and its evolution over time. Throughout this development, many different ways of using the internet have been developed allowing users to com-municate with other people. After this historical review, we present and analyze usage scenarios of the application from the end-user point of view. We present the procedures of registering and singing in the application initially and then the way we can participate in public or private chat rooms to communicate with other users of the application. The main technologies used to implement the application are in turn presented. We present their structures as well as basic functions and benefits that we have from their use. In the 4th and the last main chapter of the work, we outline the implementation techniques used for the development of the application. More specifically, the implementation of the application track server and then the client application track is presented and analyzed. Finally, a short reference is made to future additions that could be implemented in the application.