What does "free-range" means in this phrase: free-range animal production

What does “free-range” means in this phrase: free-range animal production.

What lesson does this phrase appear in?

From wikipedia:

From Wikipedia Free range - Wikipedia
Free range denotes a method of farming husbandry where the animals, for at least part of the day, can roam freely outdoors, rather than being confined in an enclosure for 24-hours each day.[1] On many farms, the outdoors ranging area is fenced, thereby technically making this an enclosure, however, free range systems usually offer the opportunity for extensive locomotion and sunlight prevented by indoor housing systems. Free range may apply to meat, eggs or dairy farming.

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