Why do I need to add a GPG-key with apt-key before adding URL to sources.list and download-installing an application with apt-get?

I took place to download and install an application today. It had it is guidelines detailed, detailed, leading being: including a GPG - key with apt-key. It was adhered to by including the application to apt/sources and also ultimately downloading it with apt-get install.

I can not get my head around the demand of including a key, prior to downloading and install an application after including the URL to resources.

Why do I require to add a GPG - key with apt-key prior to including a download URL to apt/sources and also downloading and install - mounting with apt-get install?

2022-07-25 20:43:08
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