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Understanding public key in certificate precisely

Certificates are used very often in crypto. From the search, I am a bit confused what exactly is the "public key" inside a certificate essentially? Is it always a signature verification key, or could it also be the encryption key?

In my understanding, for root and intermediate CA certificates, the public key is always meant to be the signature verification key. But is it also true for the leaf certificate (end-entity)?

Understanding public key in certificate precisely

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