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Web application architecture is a high-level structure that determines the way your product and business will operate, perform and scale. Modern web apps still use the 3-tier architecture concept, which separates applications into presentation, application tier, and data tier. Server Side Rendering (SSR) is a simple and simple way to create a straightforward website architecture. SSR is a basic type of front-end architecture type with any programming language and programming back-end. Static Site Generation (SSG) or Progressive Web app is the most straightforward way to build a website. The more interactive a website is, the closer it is to being called a web application.