A photodiode is a device that converts light into electrical current. There are several related terms that are often used interchangeably with photodiode, such as photosensor, photodetector, and light sensor. A photosensor is a type of photodiode that is used to detect light and transform it into an electrical signal. Photodetector also refers to a device that detects light, typically through absorption or reflection. Meanwhile, a light sensor is a type of photo detector that is designed to respond to different wavelengths of light. While these may seem like small variations in terminology, they all refer to the same basic concept of a device that converts light into an electrical signal.