The use of pressure in casting processes have many different aspects. Pressure reduction is commonly used for die cavity to remove the atmosphere to reduce filling related porosity with methods such as Vacuum-riserless-casting processes. Pressure is also applied on the metal side to drive and to provide means to control the die filling process, ranging from low pressure die casting to high-pressure die-casting and squeeze casting. The root cause of many problems is turbulence where methods to reduce turbulence also are used in semisolid casting. These processes are also commonly found in combinations to ensure a suitable atmosphere in the die and to allow for metal feeding doing solidification and low levels of turbulence. Each product and material offers specific challenges, and the processes are discussed with respect to their characteristics and ability to produce high quality and high integrity castings.