The document provides an introduction to concrete as a construction material. It discusses the history and origins of concrete, highlighting its use in ancient Egypt and the Roman Empire. The document outlines the key advantages of concrete such as its widespread availability, engineering properties, durability, and ability to be molded into different shapes. Some disadvantages mentioned include the carbon dioxide emissions from cement production and concrete's lower strength compared to steel. The objectives of the lecture are also stated as explaining the basic concepts of concrete, and discussing its advantages and history.