What were Jack Russell Terriers bred for?

What were Jack Russell Terriers bred for?
Jack Russell Terriers are working dogs bred for fox hunting. Reverend John Russell developed this terrier to create a dog capable of locating and driving foxes out of their dens during hunting expeditions. The breed’s keen instincts, boundless energy, and determination made them invaluable working dogs in the pursuit of foxes. While their original purpose was hunting, Jack Russell Terriers have since become beloved pets known for their lively personalities and loyalty.