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yah reddy45 Points
How web Application works
what programming languages required to build a web application? Please explain it for a beginner.
Kevin Korte28,148 Points
There are so many paths that could be chosen here, there isn't a good answer. But we can break some of it down.
But generally, to show our client something, you will have likely used html, css, and js on the client side. How to generator that code is up to you. There are many different back end languages that all net the same result. Php, ruby, python, node, and even more! And than you might use Sass, Less, or Styles to generate your css, and maybe you use coffeescript to generate your client side js. And you'll likely need to store data, so maybe you'll use a sql based database like the ever popular mysql, or postgresql, or another sql database option (yes, there's more!). Or maybe you decide to go the ways of a nosql database like something such as Mongo.
All this to say, nothing is short of html is "required" to build a web application. There are a lot of different ways you can go, and it's just a matter of fitting the pieces together to make an ecosystem of tools to build the web application.