When creating a web application, it has to be stored somewhere so web browsers can access it.
This is where operations come in. Microsoft Windows Server is an operating server that can be used to host web sites. They have their own web server called IIS which can be ran on Windows Server and this can be used to serve a web application to a web browser.
In-recent years, the DevOps process has become more popular and this is a way of integrating the deployment of a web application with the operations side. It's a way of speeding up the process to deploy an update or a fix for a web application.