The Affordable Care Act has helped millions of Americans with health care insurance but it hasn’t been without its detractors, too.

While a recent report found that coverage from health insurers is more likely to be more affordable for many than those from private health plans, health insurance companies also make a lot of money.

This isn’t to say they’re all bad.

But some of the big players are just too big to be ignored.

Here’s what you need to know about health insurance and what you can do about it.

Read more health coverage on WIRED.