What proxy server is and why it is needed?

Now everyone is talking so much about a proxy server, but I don’t understand what it is and why it is needed? After all, it is used not only by programmers, and I wonder what it is useful for.

@MelanieHilli Proxy server is kind of intermediary between client requesting the resource and the server providing this resource. You can lean more about proxy server here.
By the way the question out of scope of Aspose.Words product.

Hello. A proxy server is a service in computer networks that allows clients to make indirect requests to other network services.

You can use an already configured proxy server, which will be much more convenient. It will also allow you to control the loading of images and how they are displayed to users of your application. I usually use paid proxies like Soax for these purposes. If the proxy does not work correctly, you can always contact the support service, and they will help solve the problem.