We discussed too many topics on increasing the performance of our application. Now, let's discuss the scalability and availability of our application. With time, the traffic on our application can increase to thousands of users at a time. If our application runs on a single server, the performance will be hugely effected. Also, it is not a good idea to keep the application running at a single point because in case this server goes down, our complete application will be down.
To make our application more scalable and better in availability, we can use an infrastructure setup in which we can host our application on multiple servers. Also, we can host different parts of the application on different servers. To better understand, take a look at the following diagram:
This is a very basic design for the infrastructure. Let's talk about its different parts and what operations will be performed by each part and server.