Imperative architecture evolution

Application architecture has always been evolving alongside with demanding business requirements and evolution of technologies.

Different architecture approaches and styles, such as mainframes, client server, n-tier, and service oriented were popular at different times. Irrespective of the choice of architecture styles, we always used to build one or the other forms of monolithic architectures. Microservices architecture evolved as a result of modern business demands, such as agility, speed of delivery, emerging technologies, and learning from previous generations of architectures:

Microservices help us break the boundaries of the monolithic application and build a logically independent smaller system of systems, as shown in the preceding diagram.