Electrical signals are changes in voltage that travel along conductors, such as wires or nerve cells. These signals are essential for transmitting information in various systems, including electronic devices and biological organisms. In electronics, they can represent data, control devices, or communicate between components. In the human body, electrical signals are crucial for communication between neurons. When a neuron is activated, it generates an electrical impulse that travels along its axon, allowing it to send messages to other neurons or muscles. This process is vital for functions like movement, sensation, and reflexes.