Human evolution is the process by which modern humans, known as Homo sapiens, developed from earlier species of primates. This journey began millions of years ago when our ancestors started to walk on two legs, allowing them to use their hands for tools and other tasks. Over time, changes in the environment and lifestyle led to the development of larger brains and more complex social behaviors. As humans evolved, they spread across the globe, adapting to different climates and challenges. Key milestones in this journey include the use of fire, the creation of language, and the development of agriculture, which transformed societies and laid the foundation for modern civilization.