PKCS
Public Key Cryptography Standards
A set of standards defining key and certificate formats.
Public Key Cryptography Standards are a family of specifications, originally from RSA Laboratories, that define how keys, certificates, and cryptographic messages are formatted and exchanged. Familiar members include PKCS#7 for signed and enveloped data, PKCS#10 for certificate signing requests, and PKCS#12 for bundling a private key with its certificate in a protected file. These standards promote interoperability across PKI tools. Recognizing common file extensions like .p12 or .pfx tied to PKCS#12 is a useful exam skill.
Looking PKCS up is step one. Getting tested on it is step two.
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