You can code a web application using the famous Watson AI API from IBM, see the web apps that are made possible by this api
I am addicted to API (Application Programming Interface). API is the way to get information from a source (website) to be used in your web application. An web application is just a website that does extra processing before handing you the page. For example, the recent API that I used is the Wolfram Alpha API. I want to find a way to find a derivative of an equation given the equation, Wolfram Alpha search engine can do that. However, how do you get the answer in a plain text form? You use an API. I used the API to get the derivative of an equation, and proceed to calculate the root of an non-linear equation using Newton Method. My web application can be found here.