Torts are civil crimes and intentional torts are those cases which involve an intentional act that resulted in a negative outcome.
Tort laws allow individuals to seek compensation for acts which resulted in a negative outcome. It is somewhat easier to prove culpability in intentional tort cases. The main difference being that in tort cases individuals may not have knowingly caused the outcome. For example, an individual took some action or inaction which resulted in a negative outcome that they did not foresee.
In intentional tort, the individual took actions in the hopes that it would cause the negative outcome for another individual. The intent may have been malicious or it may not have been. All that is required to prove intentional tort is that the individual had a plan for some outcome which would result from their actions.