The App Store is an important place. You can find all kinds of apps there. Additionally, it services app updates and performs some other functions. It’s fairly noticeable when it ceases to work.
On rare occasion, you might find that the App Store app on your Mac is not working. There may be any number of problems keeping the App Store app from working, including unreliable internet, Screen ...
If you own an Apple device —iPhone, iPad, Mac, or the Apple Watch— Apple's App Store is the only source of apps for your device, which means it's a fairly big deal if you're unable to access it.