When the nervous system senses something, it sends that information to neurons in the brain using an electrical signal.
Every experience the brain encounters, whether it's during a walk in the woods, identifying a distant object, taking a pot off a hot stove, or recalling a memory, is processed through these electrical signals.
Synapses are chemical or electrical junctions that allow these electrical signals to pass between neurons and to other cells.
Changes in the amount of activity at a synapses can enhance or reduce its function.