Photocells are electronic devices that convert light into electricity. They have a variety of applications, such as in automatic lighting systems and solar panels. There are several synonyms for the term "photocells," including photoresistors, light-dependent resistors, photoconductors, photovoltaic cells, and solar cells. Photoresistors are sensors that change their resistance when exposed to light, while light-dependent resistors are photoresistors that have a higher resistance in the dark and lower resistance in the light. Photoconductors are materials that increase their conductivity when exposed to light. Photovoltaic cells and solar cells both generate electrical energy from light, but solar cells are specifically designed to convert sunlight into electricity.