How is negligence defined?

Negligence, in the context of a product liability lawsuit, is a legal theory that refers to the breach of a duty of a manufacturer to warn or make safe the products that it releases to the public. Said legal duty extends to the manufacture, assembly, use instructions and warnings about the nature of the product or device. In a negligence case, a plaintiff typically must prove that the manufacturer breached its duty of care to the public by providing unreasonably harmful products for consumer use.