Brain capacity refers to the total amount of information the human brain can store and process. While it is difficult to measure precisely, estimates suggest that the brain can hold around 2.5 petabytes of data, which is equivalent to about 3 million hours of television shows. This capacity is influenced by factors such as genetics, age, and overall health. The brain's ability to learn and remember is linked to its structure, including neurons and synapses. Neurons communicate through electrical and chemical signals, forming complex networks that enable memory and learning. The brain's plasticity allows it to adapt and reorganize itself, enhancing its capacity to store new information throughout a person's life.