\textit{Res ipsa loquitur} is a Latin maxim that means "the thing speaks for itself.
" It is a rule of evidence used in the tort of Negligence.
It applies in situations where the exact cause of an accident is not known, but the circumstances surrounding the accident are such that it would not have occurred without negligence on the part of the defendant.
For the rule to apply, two conditions must be met:
The thing that caused the injury must have been under the exclusive control and management of the defendant.
The accident must be of a kind that does not ordinarily happen if those who have the management use proper care.
If these conditions are met, the burden of proof shifts to the defendant to prove that they were not negligent.