What is founder-market fit and why does it matter more than people realize?

Founder-market fit is the intersection of market, product, and founder where you are uniquely suited to win. It is the thing where if you describe your company, the community around you stands up and cheers, funding appears almost naturally, and talent seeks you out because the mission is obvious. After selling Rapportive to LinkedIn I had become an expert in email. I could raise money easily because of that track record and I had built a following of devoted users. That created a situation where Superhuman was clearly the right thing for me to do. I explored other ideas, but this one kept calling me back. That feeling of an idea calling you back is what founder-market fit feels like.