What is the importance of place cells and grid cells? Where are they found?

Place cells are located in the hippocampus and respond when an animal enters a specific location (called a place field)in the physical environment.Grid cells are located in the entorhinal cortex and respond to very specific locations in the physical environment.They provide input to the place cells in the hippocampus.The coordination of place cells and grid cells serves not only as a navigational function but also as a memory function and ultimately guides subsequent goal-oriented behavior.