The size of the human brain is approximately 1.2 to 1.4 liters. This volume varies among individuals and is generally associated with factors such as age, sex, and overall body size. Despite its relatively small size compared to the body, the human brain is highly complex and capable of an array of functions, including cognition, emotion, memory, and motor control. Its intricate networks of neurons and synapses enable humans to perform complex tasks and adapt to their environment. Understanding brain size and structure contributes to neuroanatomy and cognitive science, enhancing our knowledge of human behavior and abilities.