Location: The smooth ER is alot like the rough ER. They are both found in plants and animal cells, and surround the nucleus.
Structure: The smooth ER does look different from the rough ER though. It is not bumpy, and it has little membranes that stick out that look like tubes.
Function: The function of the smooth ER is storage. It is very important for the storage of steroids and lipids. Source: http://www.biology4kids.com/files/cell_er.html