Pores in Activated Carbon have numerous sizes & shapes. Pore sizes have been classified into three types: Micropores (pore dia less than 20 nm), Mesopores (pore dia 20-200 nm) & Macropores (200 nm & above). While Micropore contribute maximum to the surface area, the meso & micropres serve as ‘roads’ & ‘streets’ leading to micropres. Since Activated Carbon is absolutely opaque and can neither be melted nor dissolved and it is not possible to subject it to various analytical techniques. We give below picture conceiving its structure: