A converter is a device or software that changes one form of data or energy into another. For example, a power converter can transform alternating current (AC) into direct current (DC), making it suitable for various electronic devices. Similarly, a file converter can change a document from one format to another, such as from a PDF to a Word document. Converters are essential in many fields, including electronics, computing, and telecommunications. They help ensure compatibility between different systems and devices. For instance, a video converter can adjust the format of a video file so it can be played on different media players or devices.