Javascript is very popular for use in making web pages interactive. It operates by running on the web site visitor's computer and does not need to be downloaded from the site.

Javascript is easy to use from any computer because it does not require specialized software to run. Most web browsers automatically run Javascript, so when a user enters a site that has Javascript running on it the program will automatically run on their computer as well by way of the site and the server interacting.

It is called an interpreted language and has many pre-written scripts that users can access and integrate into their site. This makes it easy to use by most people and it does not require any special training. It is one of the most popular programs used globally.