What is an application?

An application is a program or a set of programs designed to perform specific user tasks.

From an architectural perspective, an application can be:

• Client-server
• Three-tier
• Microservices
• Monolithic

Examples of application types:

• Desktop (e.g., text editor)
• Web (e.g., online store)
• Mobile (e.g., messenger)
• Embedded (e.g., washing machine software)

For QA, an application is a test object that has functional and non-functional requirements, architecture, user interface (if any), and business logic that need to be verified.