Many aspiring web developers will seek counsel on which language they should learn. The answers, based on the articles that are available on the Internet, are rarely definitive.
The sage advice for a reader is to learn any of several languages, such as Java. These types of answers circumvent the original question and do a disservice to the person who asked the question.
(Check This Out: A Brief Description of the 10 Most Popular Programming Languages)
Truth in a Proposition
Let's imagine that a web-based application has three stacks: client, server, and database. I've created a table that displays which of the 10 most popular programming languages of 2014 can be used on each stack. (If many of these programming languages are unfamiliar to you, a short description for each language is provided here)
Dynamic web-based applications, compared to static web-based applications, can change the content on a webpage without fully reloading the page. What I'm describing frequently occurs this way: a user-based action — such as moving a mouse or clicking a key on a keyboard — triggers an event that updates a part of a webpage. Consider how many web-based applications include this type of behavior. You will then realize that I'm describing all modern web-based applications.
Aspiring web developers can learn one of many languages. This point is made clear in the numerous articles written on this topic. What's less clear is which specific language these developers should learn.