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For questions regarding the generation or flow of electrical charge.

From Wikipedia:

Electricity is the set of physical phenomena associated with the presence and flow of electric charge. Electricity gives a wide variety of well-known effects, such as lightning, static electricity, electromagnetic induction and electrical current.

Electricity can stem from natural sources (e.g. lightning) or can be artificially generated. It is often used to provide power to devices, and is vital in the functioning of many biological systems such as neurons.