What is Forward Secrecy and How to Enable it?

I just configure my server to serve over https and it work well, when I test using Qualys SSL Lab I just got A- grade. It says that my “server does not support Forward Secrecy with the reference browsers”. So what is Forward Secrecy actually? I have searched on DO tutorial but found nothing. How to enable it so I can get A+ grade?

Thank in advance

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