RE:Grid Cell

Good day sir,

Please i have been reading a couple of day on grid cell and there are some points i would like you if possible to clear them for me… as you have been playing around grid cell.

These are the points

1-What is the use of grid cell in HTM?
2-is grid cell similar to spatial pooler?
3-how can grid cell be useful to improve the current SP?
4- the grid cell have the information of location, how to use it to change the SP training method?

Those are the questions that get me confuse about Grid Cell.

Thanks in advance and have a great day