[Python] What is the difference between Image.resize and Image.thumbnail in Pillow-Python

I want to resize an image in pillow-python, however I have 2 functions of choice to use:

Image.resize http://pillow.readthedocs.org/en/latest/reference/Image.html#PIL.Image.Image.resize

and

Image.thumbnail http://pillow.readthedocs.org/en/latest/reference/Image.html#PIL.Image.Image.thumbnail

Both definitions point out to resizing the image, Which one should I be using?

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