As outlined previously, the role and responsibility of software is on the climb. The software is participative, pervasive, and persuasive, too. All business establishments embrace software engineering technologies and tools to bring in deeper and more decisive automation. Industry verticals are keen on strategizing and strengthening their software portfolio in order to get ahead of their competitors. Software developers across the globe build, curate, refine, and deposit their software applications in publicly available software registries/repositories to facilitate overwhelming usage. Therefore, with the faster proliferation of software modules, the application of software packages, products, and programs is growing steadily. The application landscape is expanding its horizon constantly. The application types are also expanding correspondingly to tackle more complex requirements, since there is a widespread realization that software decides the automation journey. In the following sections, we'll discuss the principal application types.