Question

explain the meaning of the statement electric charge of a body is quantized ​

Answer 1

it means that only integral number of charge can be transfer from one place to other.

Answer 2

$\textbf{Electric charge is quantized}$. It means a substance or a body has electric charge which exist in discrete packets.

Any charged body or substance has a total electric charge q which is an integral multiple of charge on an electron (e)

That is, q = ±ne, where n = 1,2,3,... and e =1.6×10^-19