Adipocytes, are fat cells. There are two types of fat cells:
White Fat Cells, which are the most common type in adults. These are unilocular (have a single large lipid droplet), have a large diameter (100µm or more), and are found in subcutaneous, omentum & mesentry regions.
Brown Fat Cells are multilocular (each cell has many small lipid droplets). They are smaller than white adipocytes. They are present in large amounts in the new-born & hibernating animals. In adults restricted to areas around kidney, aorta and regions of the neck and mediastinum.