Electrical signals refer to a form of energy that is transmitted through electrically charged particles. These signals are generated by various sources such as nerve cells, muscle contractions or electronic devices and can be used to transmit information over long distances without any loss in quality. In the context of biology, these signals play an important role in communication between different parts of the body, including the transmission of sensory data from the brain to other organs, as well as controlling muscle movements through electrical impulses.