Memory and learning are among the most essential cognitive functions of the human brain. They allow individuals to acquire knowledge, develop skills, and adapt to their environment. Learning depends on complex biological changes that occur within the nervous system, particularly within neurons and their connections. The brain consists of billions of neurons that communicate through specialized junctions known as synapses. When a person learns new information or acquires a skill, changes occur in the strength of these synaptic connections. This process is known as neuroplasticity, the brain’s ability to reorganize itself in response to experiences. One of the most important mechanisms involved in learning is long-term potentiation (LTP). LTP occurs when repeated stimulation of synapses increases the efficiency of signal transmission between neurons. As a result, neural connections become stronger and more effective, allowing information to be stored for long periods. Several brain regions are crucial for memory formation. One of the most important is the hippocampus, a structure located in the limbic system. The hippocampus plays a key role in converting short-term memories into long-term memories. The cerebral cortex, especially the prefrontal cortex, is also involved in planning, decision-making, and memory retrieval. At the molecular level, neurotransmitters such as glutamate and dopamine play significant roles in learning. Glutamate is the primary excitatory neurotransmitter and is essential for strengthening synaptic connections. Dopamine, on the other hand, is associated with motivation and reward pathways. Furthermore, proteins and gene expression are essential for memory consolidation. When a new memory is formed, specific genes are activated to produce proteins that strengthen synaptic connections and help form new neural pathways. In conclusion, memory and learning are not merely psychological processes; they are the result of precise biological changes occurring at the cellular and molecular levels within the brain. Al-Mustaqbal University – the first university in Iraq.