The rate of flow of an electric charge is the current.
Conductors such as metals conduct electricity because they contain delocalised electrons which can move freely throughout the metal's atomic structure.
Insulators cannot conduct electricity because their electrons are held in the atoms.
Conductors only hold charge if it is insulated from the ground. To charge an insulated conductor, it needs to be brought into contact with a charged object.
To safely discharge a conductor, you need to 'earth' it by providing a conduction path, e.g. a wire, between the object and the ground so electrons can transfer into the earth.
The more charge a conductor has, the higher its electric potential energy. The potential difference (i.e. voltage) between the conductor and ground increases.
At high enough potential differences a spark may be produced to jump between conductors and nearby earthed objects. Lightning is an example of this.
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