A very small bag in one part of your application just brought everything down. Login, down. Payments, down. Search, down. How can one tiny bag bring down an entire application? Let's imagine we're building an online store. Login, payments, search, notification, products, all that. At first, we'll put everything into one application, and everything runs in that one application. This is called a monolith. It's not necessarily bad. It's simple to build, deploy, and even test. But imagine the notification system has a bag, and it crashes the entire application process. Now, login goes down, payments go down, search goes down, not because they are broken, but because they are all running together. So what if we split the application? Login becomes one service, payment, another, search, another, notifications, another service. Now, each service is running independently. This is microservices. These services won't run inside one application process. They communicate over a network. For example, the order service might call the payment service to process a payment. So what does this mean? If notification clashes, then it means login can still keep running, payments can still keep running. And if such is getting heavy traffic, you only have to scale such.
And that right there is the power of microservices. But microservices aren't free. You've basically treated the application simplicity for a distributed system complexity. And now you have network failures, timeouts, retries, monitoring, logging, and now you're debunking across multiple services. A simple function call can become a network request that might fail. You might be asking, so which one is better? Neither of them. Monolids are simpler and often the right choice for smaller systems. Microservices makes sense when you need independent scaling, independent deployments, or strong isolation. So don't build 20 services just because microservices sounds better. Start simple, find the problems, then split the system when you actually need to. Because at the end of the day, good architecture isn't just using the most advanced technology. It's about solving the problems you actually have. So monolith first, microservices when you actually need them.
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