Most all Web browsers have a Web Inspector (F12) that allows you to view network traffic. However, what happens if you are using some type of application that does not have a Web Inspector? You could turn to Wireshark, but usually Wireshark is a deep dive at the packet level. Sometimes, what you need is just a Web Insepctor. This is where Fiddler can really help you out.
You can download and install Fiddler from https://www.telerik.com/download/fiddler.