Eligible Rollover Distribution

A distribution from an IRA, qualified plan, 403(b) plan or 457 plan that is eligible to be rolled over to another eligible retirement plan.

Investopedia Says:
Often, an eligible rollover distribution occurs when an individual leaves the service of an employer. The rollover rules allow the individual to bring the assets to their IRA or a retirement plan at a new employer.

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You may want to do so if you are changing jobs or retiring, but make sure you know the rules and your options. Moving Your Plan Assets?

Payments from an employee's Employee Benefit Insurance Plan that can be rolled over to an Individual Retirement Account (IRA) or to another plan maintained by the employer that accepts rollovers.