Microservices are not a tool, rather a way of thinking when building software applications. Let’s begin the explanation with the opposite: if you develop a single, self-contained application and keep improving it as a whole, it’s usually called a monolith. Over time, it’s more and more difficult to maintain and update it without breaking anything, so the development cycle may become a continuous progress of fixing some things while breaking others. If you apply the way of microservices, then you break down a potential monolith into smaller, more manageable, self-contained individual pieces that communicate with each other when needed. Then you don’t have to worry that much when you add more features because changes in a service can’t break a feature in another. This not only saves time, but makes development more secure too. It’s also easier to distribute work among autonomous teams, even across the globe.