Silhouette from image

I want to turn a person in a photo into a silhouette, how do I do that?
I also want to remove the background behind the person.
I think I remember you (adina) showing us a quick how to do that in after effects…

is it animated? and are you doing it in after effects?
if its still, easiest way to do it would be photoshop with your selection tools
if its animated you can rotoscope it OR depending on the background if its enough contrast you can track matte it. Possibly using the key light effect would work as well