To boil something, you cook it in hot, steaming water, often for a long time. Parboiling takes boiling down a notch. When you parboil, you boil just a little while, which is enough for some vegetables but for other food that's just the first step in the cooking process.
This method of partial cooking is vital for home cooks Parboiling is a method of partially cooking food in boiling water. When a recipe calls for parboiling, it is referring to the partial boiling of an ingredient just until it is soft but not cooked through.