Shark attacks are rare incidents where sharks bite humans, often occurring in coastal waters. Most species of sharks are not dangerous to people, and attacks usually happen when a shark mistakes a person for its natural prey, such as seals or fish. The number of shark attacks varies each year, with factors like water temperature and human activity influencing occurrences. Safety measures, such as avoiding swimming at dawn or dusk and staying in groups, can help reduce the risk of an encounter with a shark.