Hello saawan !!

Electrochemistry is the branch of chemistry ,studies of electricity and how it relates to the chemical reactions.Generally,study of production of electricity from the energy that is released during spontaneous  chemical reaction and the use of electrical energy to bring about Non spontaneous  chemical transformation . Electrochemistry is used in various fields and industries.Better example for this is a battery cell,a device that stores chemical energy and available as electrical form.I hope this information helps you a little bit.Thank you!!