A hidden camera is a small device designed to record video or audio without being easily noticed. These cameras are often used for security purposes, such as monitoring homes or businesses, or for capturing events without the subjects being aware. They can be disguised as everyday objects like smoke detectors or picture frames, making them difficult to detect. In addition to security, hidden cameras are sometimes used in reality TV shows or social experiments to capture genuine reactions from people. However, the use of hidden cameras raises ethical questions about privacy and consent, especially when recording individuals without their knowledge.