Dolphins are certain aquatic mammals related to whales and porpoises

The name is from Ancient Greek delphis meaning “with a womb”, viz. “a ‘fish’ with a womb”. The word is used in a few different ways. It can mean: any member of the family Delphinidae (oceanic dolphins), any member of the families Delphinidae and Platanistoidae (oceanic and river dolphins), any member of the suborder Odontoceti (toothed whales; these include the above families and some others), laypeople often use the term synonymously with Bottlenose Dolphin, the most common and familiar species of dolphin.
In this article, the second definition is used.

There are many animals which may appear similar and may have similar living environment, and only scientists know that these belong to different families. Sometimes people do not realize that dolphins are not fish, but mammals.  

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Porpoises (suborder Odontoceti, family Phocoenidae) are thus not dolphins in our sense. Orcas and some related species belong to the Delphinidae family and therefore qualify as dolphins, even though they are called whales in common language. There are almost 40 species of dolphin in 17 genera. They vary in size from 1.2 metres and 40 kg (Heaviside’s Dolphin), up to 9.5 metres and 10 tonnes (the Orca). Most species weigh between about 50 and about 200 kg. They are found worldwide, mostly in the shallower seas of the continental shelves, and all are carnivores, mostly taking fish and squid. The family Delphinidae is the largest in the Cetacea, and relatively recent: dolphins evolved about 10 million years ago, during the Miocene.

Above Images Come From The National Undersea Research Program