Public nuisance refers to an act that significantly interferes with the public's ability to enjoy common rights, while private nuisance involves a substantial and unreasonable interference with an individual's use and enjoyment of their property. Understanding the distinction between these two types of nuisance is crucial for assessing liability in tort law, as they each have different legal standards and implications for affected parties. Public nuisances typically impact a broader community, while private nuisances are more focused on individual property rights.