Health insurance is a contract between you and an insurance company. You pay a regular fee, and in return, the company agrees to pay a portion of your medical costs. Think of it as a safety net. It helps you get medical care when you need it without facing the full, often staggering, cost alone.

Its main purpose is twofold: to ensure you can access necessary healthcare services and to protect you from the financial hardship that can come from unexpected illness or injury. Without it, a broken arm or a sudden sickness could lead to overwhelming debt.

To understand your health plan, you need to know its language. These key terms define what you pay and when you pay it.

This is like a subscription fee. Whether you use your insurance or not, you must pay your premium to stay covered.

For example, if your deductible is $1,500, you pay for your medical care until the amount you've paid reaches $1,500. After that, you and your insurance company start sharing the costs.

This is a flat fee you pay on the spot for things like a doctor's visit or filling a prescription. It’s your share of the cost for a specific service.

Let's say your plan has 20% coinsurance. After you meet your deductible, if you have a $100 medical bill, you pay $20 and your insurance company pays $80.

Health insurance plans aren't one-size-fits-all. They are structured differently, mainly based on their network of doctors and hospitals and the rules for seeing them. A plan's network is the group of providers that have agreed to lower their rates for the plan's members.

Here’s a quick breakdown:

• HMOs are often the most affordable, but they're also the most restrictive. You choose a Primary Care Physician (PCP) who manages your care, and you need a referral from them to see a specialist. Care is only covered if you stay within the HMO's network.

• PPOs offer the most flexibility. You don't need a PCP or referrals, and you can see providers both in and out of the network. However, this flexibility usually comes with higher monthly premiums and higher costs for out-of-network care.

• EPOs are a hybrid. Like a PPO, you don't need a PCP or referrals. But like an HMO, you must use doctors and hospitals within the network for care to be covered.

• POS plans combine features of HMOs and PPOs. You typically need a PCP and referrals, but you have the option to go out-of-network for care, though it will cost you more.

Understanding these core concepts is the first step toward making informed decisions about your healthcare.