The sonic screwdriver is a fictional tool used by the character The Doctor in the British television series Doctor Who. It is a versatile device that can perform various functions, such as unlocking doors, scanning objects, and repairing technology. The sonic screwdriver is known for its distinctive sound and glowing tip, which indicate its activation. This tool does not physically cut or screw but instead uses sonic waves to manipulate objects at a molecular level. The sonic screwdriver has become an iconic symbol of the series, representing The Doctor's intelligence and resourcefulness in solving problems without violence.