The photoacoustic effect is a phenomenon where materials emit sound waves after absorbing modulated light, such as a pulsed laser. When the material absorbs the light energy, it heats up rapidly, causing thermal expansion. This sudden expansion generates pressure waves, or sound, in the surrounding medium - often air. In cybersecurity and digital forensics, the photoacoustic effect can be used for non-destructive analysis of electronic components, detection of tampered devices, or identification of hidden hardware. By analyzing the unique acoustic signatures produced, security professionals can detect anomalies or unauthorized modifications without physically dismantling the device.