A bear attack is an incident in which a bear physically attacks or tries to harm a human, either intentionally or defensively. This can occur when humans encroach on the natural habitat of bears, causing them to feel threatened and respond with aggression. Bears are powerful animals and can cause serious injury or even death if they attack. Precautions should always be taken when in areas where bears may be present, such as national parks or forests, to minimize the risk of a bear attack.