A feral cat is a cat who has either never had any contact with people or her contact with people has diminished over time. She is not socialized to people and survives on her own outdoors. Most feral cats are not likely to ever become lap cats or enjoy living indoors.
Outdoor cats have existed alongside humans for 10,000 years. They are not a new phenomenon. Feral cats are members of the same species as pet cats—and are therefore protected under state animal anti-cruelty laws.
The difference between feral cats and your pet cat is that they have had little or no contact with people, and so they are wary of us, and cannot be adopted. They have a home—outdoors. They live and thrive in every landscape, from the inner city to rural farmland.
Since feral cats are not adoptable, they should not be brought to animal pounds and shelters, because there they will likely be killed.