.pem=> Privacy Enhancement Mail Certificate.keyextension => is a PEM file containing just the private-key.pkcs|.pfx|.p12=> is a fully encrypted passworded container format that contains both pubkic and private certificate pairs.cert|.cer|.crt=> is a public .pem formatted file with diffrent extenssions for windows
*.private.pem=*.key.pem=*.key*.public.pem=*.crt.pem=*.crt=*.cer.pem=*.cer- passworded(
*.key+*.cer) =*.pkcs|*.pfx|*.p12*.key.pem+*.crt.pemin one file =>*.keycer.pem