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Supposed we had 3 web apps which up and running on their own ports.
  - app1 : BASE_URL:7000
  - app2 : BASE_URL:7001
  - app3 : BASE_URL:7002

Now we already have our NGINX serving on port 80. So, opening a web browser and typing our server's URL will show us `Welcome to nginx!` page.

Now we want to have our apps to be accessed via URL, like:
  - app1 : BASE_URL/app1
  - app2 : BASE_URL/app2
  - app3 : BASE_URL/app3

Instead of using port numbers.
We can use NGINX for these requirements.