Schematic plot of the magnetization and magnetic induction of an ideal type-II superconductor. The blue (red) solid line corresponds to the magnetization (magnetic induction). Blow H_c1, no vortices enter the superconductor. Above H_c1, vortices enter into the superconductor forming the mixed state. Above H_c2, any droplet of superconductivity will disappear, the system comes into the normal state.