The following diagram displays the back-end components of this very application, the Biztory Embedding Gallery, and how they are "connected".
These components are representative of most generic and classic web applications. We have a web application running on a web server like Apache, utilizing a database, all of which are components present in most (classic) architectures for applications like this.
In addition to that, it's worth noting that we've opted for Flask to be used as the framework for our application. This is probably a rather unusual choice, though it made sense in this case given our affinity with Python. There is a lot more to be said about this architecture, though that is not the focus of this Gallery as many real-life examples will differ based on requirements and specifics.