This lecture introduces the classification of slabs based on their supporting elements, either linear or point supports. The instructor explains the differences between the two types using examples of construction systems with different support structures, such as columns, beams, and precast concrete planks. Various types of slabs are discussed, including slabs on linear supports with beams and walls, as well as slabs on point supports with columns. The lecture also covers solutions to distribute loads more effectively, such as mushroom-shaped supports and thickening the slab locally. Additionally, the concept of ribbed slabs or voided slabs is presented as a common solution in construction.