This master’s thesis describes the Angular framework and the mechanisms included within that allow for the fast development of client applications both on mobile and web platforms. Since it is a universal framework, knowledge of multiple programming languages for different platforms is not required and the majority of the source code can be used on every platform. An Angular application consists of components nested within a tree and a set of components comprises a logical unit is located within a module. View manipulation is the task of the directives, while by dependency injection we supply various parts of the application with objects that are necessary for its functioning. By developing applications using the Angular framework we apply programming paradigms such as reactive programming to efficiently take into account whether the data that represents the state of the application is up-to-date. Alongside Angular it is important to mention React as well - a rival and currently most popular universal framework.