Concrete columns are vertical structural elements made from a mixture of cement, water, and aggregates. They are designed to support loads from beams, slabs, and other structural components, transferring weight down to the foundation. Concrete columns are commonly used in buildings, bridges, and other infrastructure due to their strength and durability. These columns can be reinforced with steel bars, known as rebar, to enhance their load-bearing capacity and resistance to cracking. They come in various shapes, including rectangular, square, and circular, and can be pre-cast or poured in place, depending on the construction requirements and design preferences.