The USDA definition of these interchangeable terms, "producers must demonstrate to the Agency that the poultry has been
allowed access to the outside," applies only to poultry meat (not egg-laying hens) and suggests that the animals were raised in an unconfined environment. However, the USDA’s requirement is somewhat vague and does not include any minimum amount of time for outdoor access. “Free-range” labels on beef, pork, and eggs are not regulated.
Example of Free-Range/Free-Roaming:
As more people become concerned with a humane food production, many chicken farmers are adopting free range practices. Free ranged chickens are believed to taste better as they are raised in a less stressful environment.