@RusA #9857362 A stray cat is a homeless cat that wanders around at large and scrounges for its food. A foster cat is one that is taken in temporarily by a private person or family, usually from an animal rescue group or animal shelter, for a set amount of time or until the cat is properly adopted. Same thing as a foster child, really, except that it's a cat. This is done for various reasons: animal rescue groups may not have a place to house the cats they find, and animal shelters may not have sufficient room, or want to make room for new animals.
So a stray cat might be caught by a rescue group, which then finds someone to foster it, and eventually it gets someone to adopt it permanently as a house pet.
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@RusA #9857362 A stray cat is a homeless cat that wanders around at large and scrounges for its food. A foster cat is one that is taken in temporarily by a private person or family, usually from an animal rescue group or animal shelter, for a set amount of time or until the cat is properly adopted. Same thing as a foster child, really, except that it's a cat.
So a stray cat might be caught by a rescue group, which then finds someone to foster it, and eventually it gets someone to adopt it permanently as a house pet.