The PKCS#12 or PFX format is a binary format for storing the server certificate, any intermediate certificates, and the private key into a single encryptable file.
PFX files are usually found with the extensions .pfx and .p12.
PFX files are typically used on Windows and macOS machines to import and export certificates and private keys.
原文：https://www.cnblogs.com/chun2021/p/14801991.html