Savings Incentive Match Plan For Employees Of Small Employers - SIMPLE

What Does Savings Incentive Match Plan For Employees Of Small Employers - SIMPLE Mean?
A retirement plan that may be established by employers, including self-employed individuals. The employer is allowed a tax deduction for contributions made to the SIMPLE. The employer makes either matching or non-elective contributions to each eligible employee's SIMPLE IRA and employees may make salary deferral contributions.

Investopedia explains Savings Incentive Match Plan For Employees Of Small Employers - SIMPLE
The employer has two alternatives when it comes to making contributions. The first is to match the amounts that each employee makes toward his or her own elective-deferral contribution  up to 3% of the employee's annual compensation. The second alternative is for the employer to make a flat 2% nonelective contribution to all qualified employees, regardless of whether the employee makes any contributions.

Contributions to SIMPLE IRAs are immediately 100% vested, and the IRA owner directs the investments.