Rebar is a shortened term for reinforcing bar, which refers to steel bars used in construction to provide strength and durability to concrete structures. These steel bars are embedded into the wet concrete during the pouring process, and they help to prevent cracking and increase the overall strength of the structure. Rebars come in various sizes and shapes depending on their intended use, with common types including straight rebar, hooked end rebar, and bent rebar. They play a crucial role in ensuring that buildings are safe and stable, making them an essential component of many construction projects.