What is electrochemistry? Give the uses of electrochemistry.

(N/A) Electrochemistry is the study of the production of electricity from energy released during spontaneous chemical reactions and the use of electrical energy to bring about non-spontaneous chemical transformations.
Applications: The theoretical and practical utilization of electrochemistry is as follows:
$(i)$ Many metals,sodium hydroxide,chlorine,fluorine,and many other chemicals are produced by electrochemical methods.
$(ii)$ Batteries and fuel cells convert chemical energy into electrical energy and are used on a large scale in various instruments and devices. The reactions carried out electrochemically are more energy-efficient and less polluting.
$(iii)$ Therefore,the study of electrochemistry is important for creating new technologies that are ecofriendly.
$(iv)$ The transmission of sensory signals through cells to the brain and vice versa,and communication between cells,are known to have an electrochemical origin.
Electrochemistry is,therefore,a very vast and interdisciplinary subject.