Bio-char is a carbon-rich product obtained from the pyrolysis of organic biomass under limited oxygen conditions. It has gained attention in the construction industry due to its potential to enhance the properties of cement and concrete. When incorporated into cement and concrete, bio-char can improve material characteristics such as durability, mechanical strength, and environmental resistance. The effectiveness of bio-char is particularly noteworthy under severe environmental conditions, such as extreme temperatures, moisture exposure, and chemical aggressiveness, where traditional construction materials may fail or degrade rapidly. Understanding the role of bio-char can help in developing more sustainable and resilient building materials.