SSR vis CSR for application

SSR refer to Server side rendering mechanism, as the name imply, the web page is rendered on the server then get send to the client, this approach reduce the load on the client and enhance SEO.

CSR refer to Client side rendering, used mostly by single page applications with a lot of dynamic UI component, like grid table, chatroom. they handle page update via http request and server only send the data need for rendering, meaning less data get transfer in the pipeline.