Define electricity ?

Hint:Here we will learn about the concept of electricity, its branches, what kind of forces act between two electrons and what it is and how is it expressed mathematically.Electricity is a phenomenon which is associated with stationary or moving electric charges. Electric charge is a fundamental property of matter and is borne by elementary particles.

Complete answer:
The electron is the particle involved in electricity, and it bears a charge that is designated as negative by convention. As a consequence, the different manifestations of electricity are the result of the aggregation or motion of a large number of electro-magnetic particles.

Electrostatics is the study of electromagnetic phenomena that arise when no moving charges are present, i.e. after a static equilibrium has been achieved.Charged particles are moved from one body to another in static electricity, which is a well-known electric phenomenon.The object that loses electrons becomes positively charged, while the object that gains electrons becomes negatively charged. The force is essentially the attraction of opposite-sign charges.

Coulomb's law describes the electric force exerted on a charge ${Q_1}$ under these conditions by a charge ${Q_2}$ at a distance $r$, it can be expressed mathematically as, $F=k\dfrac{{{Q}_{1}}{{Q}_{2}}}{{{r}^{2}}}\hat{r}$.
Electro dynamics can be defined as the study of the phenomena associated with the moving electric charges and their interaction with electric and magnetic fields.

Note:Difference between Electrodynamics and Electrostatic can be given as: the analysis of static electrical charges is known as electrostatics (like balloons that can be made to stick to the ceiling if we first rub them against a jumper). The study of moving electrical charges is known as electrodynamics (that is, ones that are changing over time).