Can apps access another app's data?

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A

Android Central Question

As title says, can apps access another app's data?

The reason i'm asking is I am required to use the security disaster that is Wechat, as my company does business with some Chinese partners. And we need ir to communicate with them.

I know that Wechat must have access to microphone, contacts, sms, etc. But could it also access data stored in apps such as Whatsapp and email?