Health Savings Accounts (HSAs) are tax-exempt accounts where funds grow to pay for medical expenses. They were created to help give control back to consumers and lower healthcare costs. HSAs provide a financial incentive for consumers to select a high deductible health plans, HDHPs have lower monthly premiums than traditional plans.
An HSA is your account. If you switch jobs, the HSA goes with you. Your money rolls over every year. There is no "use it or lose it" requirement.
High Deductible Health Plans
In order to open an HSA, you must have a qualified High Deductible Health Plan. The IRS
determines the guidelines for qualified HDHPs.