it is the capacity 2 store charge ........

when two platesof infinite length have small distance between them contain oppposite and equal charges then their capacity is called capacitance

i hope u understood

Capacitance is a measure of the amount of electric charge stored (or separated) for a given electric potential. The most common form of charge storage device is a two-plate capacitor. If the charges on the plates are +Q and −Q, and V gives the voltage difference between the plates, then the capacitance is given by

The SI unit of capacitance is the farad; 1 farad = 1 coulomb per volt.