ERISA is  Employee Retirement Income Security Act of 1974.

ERISA is a federal law that sets minimum standards for pension plans in private industry.  For example, if an employer maintains a pension plan, ERISA specifies when an employee must be allowed to become a participant, how long they have to work before they have a nonforfeitable interest in their pension, how long a participant can be away from their job before it might affect their benefit, and whether their spouse has a right to part of their pension in the event of their death.  Most of the provisions of ERISA are effective for plan years beginning on or after January 1, 1975.

ERISA does not require any employer to establish a pension plan.  It only requires that those who establish plans must meet certain minimum standards.  The law generally does not specify how much money a participant must be paid as a benefit.

ERISA requires plans to provide participants with information about the plan including important information about plan features and funding.  The plan must furnish some information regularly and automatically.  Some is available free of charge, some is not.
ERISA sets minimum standards for participation, vesting, benefit accrual and funding.  The law defines how long a person may be required to work before becoming eligible to participate in a plan, to accumulate benefits, and to have a nonforfeitable right to those benefits.  The law also establishes detailed funding rules that require plan sponsors to provide adequate funding for your plan.
ERISA requires accountability of plan fiduciaries.  ERISA generally defines a fiduciary as anyone who exercises discretionary authority or control over a plan’s management or assets, including anyone who provides investment advice to the plan.  Fiduciaries who do not follow the principles of conduct may be held responsible for restoring losses to the plan.
Gives participants the right to sue for benefits and breaches of fiduciary duty.
Guarantees payment of certain benefits if a defined plan is terminated, through a federally chartered corporation, known as the Pension Benefit Guaranty Corporation.

Source: DOL

The Form 5500 Annual Report is the primary source of information about the operations, funding and investments of approximately 800,000 retirement and welfare benefit plans. The datasets below are the raw, unedited data from all of the Form 5500 and Form 5500-SF filings for each year, including the data reported in the various schedules.