What Exactly Product Marketers Do?

Hey Folks, I am in the middle of the research of what PMMs do in their career. I got confused while looking out the JDs of PMM. Some of them include 1. Responsible to create blogs, social post - What content writers literally do 2. Manage landing pages & SEOs - What SEO managers do and so on. so, I just want to post my doubt here, so that hopefully i can get a clear answer. Looking forward to it!