Column formwork is a construction technique used to create vertical structures, such as columns and pillars, in concrete buildings. It involves using molds, typically made of wood or metal, to shape the concrete as it sets. This method ensures that the columns have a uniform shape and size, which is essential for the structural integrity of the building. The formwork is assembled around the area where the column will be poured. Once the concrete is placed and has cured, the formwork is removed, leaving behind a solid column. This process is crucial in construction projects, as it allows for efficient and precise creation of vertical supports, contributing to the overall stability of the structure.