A sandal is a shoe with an open top. They don't have shoelaces, but are usually latched together with either a belt-like strap, or velcro. A flip flop is like a sandal, but usually much less sturdy, and more bendy, or "cheap". You can just slip them right onto your foot. A slipper is another slip-on shoe that is used for comfort, they are usually furry or squishy on the inside. You usually do not wear slippers outside, at the store, etc, mostly just for comfort inside your home. :)

check out this link ( it is a visual dictionary ) , ( you can see the pictures of different shoes ) http://visual.merriam-webster.com/clothing-articles/clothing/shoes/unisex-shoes_2.php http://visual.merriam-webster.com/clothing-articles/clothing/shoes/womens-shoes_1.php

Here's some extra confusion: they can all be the exact same piece of footwear. 'Flip-flops' is used in English-speaking countries, but not commonly. In Australia we call them 'thongs'. 'Sandals' is how my Brazilian friends refer to them when they speak English ("chinelo"?) 'Slippers' is what my Malaysian friends have called them (though these were specifically for indoors). http://en.wikipedia.org/wiki/Flip-flops

Please add me in msn.i can give some pictures to discriminate them.

I use them interchangeably although there may be minor differences :P