In H-mode, the change in confinement is the most apparent at the edge of the plasma where the pressure gradient increases rapidly due to the increase in edge density, leading to the formation of a pedestal-like structure in the radial profile of the plasma parameters. It also typically features a type of magnetohydrodynamic instability called the edge-localized modes (ELMs), which appear as periodic bursts of particle and heat flux and can potentially cause excessive heating of plasma-facing components.