Hash Routing - rvdegroen/notes GitHub Wiki
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What is hash routing?
The has router is a "routing" system for a SPA (client-side single page application). This lets you navigate within your app, without a server-side aka back-end.
The hash gets used so you don't have to make a new request to the server. This means that the page can be updated, without it needed to be reloaded.
I made a sketch to make this idea more clear: