Final answer:
Synaptic plasticity is the process where synaptic connections in the brain are preserved based on use, which is essential for learning and memory.
Step-by-step explanation:
The process described wherein synaptic connections in the brain that are frequently used are preserved and those that are not used are lost is known as synaptic plasticity. This is a fundamental characteristic of how the brain adapts and organizes itself. Synaptic plasticity is vital for learning, memory, and the overall functionality of the nervous system. For instance, processes like long-term potentiation (LTP) and long-term depression (LTD) showcase the dynamic nature of synapses, especially in brain regions such as the hippocampus, which is essential for memory storage.