The start of November means more than the holiday season is upon us. It also marks the beginning of open enrollment for health insurance through the federal marketplace.

Open enrollment insurance plans are commonly known as Obamacare. This is different than insurance through work or Medicare.

This year, enrollment in the Affordable Care Act Marketplace hit a record high. According to the KFF, it reached over 21 million people who enrolled. The KFF said there’s a reason for that growth.