What is the relationship between these openssl files: example.cer example.key example.pem example.crt?

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I am config the ssl using Mechanize , according the document I need to set the

agent.cert = 'example.cer'
agent.key='example.cer'

but how can I get these two file? I also find that ssl file has a lot of types, such as .cer .pem .crt .key, what is the relationship between them?

asked 50 secs ago

roger

309

What is the relationship between these openssl files: example.cer example.key example.pem example.crt?