Which certificate file format should I use when exporting a certificate on Mac computer? What is the "Certificate Bundle (.p7b)" format?

When exporting a certificate from Keychain Access to a file, it offers 3 certificate file formats for you:

• "Certificate (.cer)" - This format uses the DER (Distinguished Encoding Rules) encoding to store certificate content as a binary file.
• "Privacy Enhanced Mail (.pem)" - This format uses DER algorithm to encode the certificate first. The output is then Base64 encoded into printable characters and stored as a text file.
• "Certificate Bundle (.p7b)" - This format uses the PKCS#7 (Public-Key Cryptography Standards #7) algorithm to store certificate content as a binary file. It is capable to store a chain of multiple certificates into a single file.

⇒ Delete Root CA Certificate from Mac

⇐ Export Root CA Certificate from Mac to File

⇑ Managing Certificates on Mac Computer

⇑⇑ Apple Mac Certificates Tutorials