What is current? Please explain it.

Solution:
In general, electric current is nothing but flow of charge. Any movement of electric charge, such as electrons (having negative charge), proton (having positive charge), ions (can have both positive or negative charge) and holes (electron deficiency in semiconductor that may be treated as positive particles) can be termed as current
Mathematically;
Current can be written as;
$$\begin{gathered} Current \left(I\right)=\frac{charge\left(Q\right)}{time\left(t\right)} \\ it has SI unit of Ampere \end{gathered}$$