I am trying to use ffmpeg to separate audio from video, but after downloading the ffmpeg build I cannot seem to activate it in Power Shell

Question

Ok, look y'all, I am NOT an aspiring programmer. I'm simply trying to separate audio from video of a youtube video I downloaded.

What I've done:

Downloaded YT vid using 4k video Downloader

I downloaded ffmpeg build from https://ffmpeg.org/download.html#build-windows

I downloaded WinZip in order to access the ffmpeg files.

I thought I used winzip correctly, but whenever I paste the command code line recommended to me, ffmpeg -i video.mp4 -c:a pcm_s16le audio.wav, I receive the following:

PS C:\Users\user\Videos\4K Video Downloader> ffmpeg -i video.mp4 -c:a pcm_s16le audio.wav ffmpeg : The term 'ffmpeg' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again. At line:1 char:1

• ffmpeg -i video.mp4 -c:a pcm_s16le audio.wav

•   + CategoryInfo          : ObjectNotFound: (ffmpeg:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException
  
  

PS C:\Users\user\Videos\4K Video Downloader>

This is all Phoenician to me, but what I take away is that I have not completed some step to fully incorporate the ffmpeg code into my system. I believe that I am not using Winzip correctly.

Thanks for your time.