Password

So I’m in settings; passwords; and looking into my iCloud Apple ID password specifically, and as look in deeper; I notice that it is being used on 3 websites under Apple.com l: those being idsma.apple.com; secure1.store.apple.com; secure2.store.apple.com; can someone tell me is my Apple ID, being used on these sites and why? After being an Apple soldier for jeesh… since Apple went mainstream, I’m a bit upset with myself that I don’t already know these things. But anyways help would be greatly appreciated…. Namaste 🪷