Stock, sometimes called bone broth, is a savory cooking liquid that forms the basis of many dishes – particularly soups, stews, and sauces. Making stock involves simmering animal bones, meat, seafood, or vegetables in water or wine, often for an extended period. Mirepoix or other aromatics may be added for more flavor.
Making stock in a pot on a stove top
Pouring fish stock on a stuffed fish
Soup is a primarily liquid food, generally served warm or hot, that is made by combining ingredients of meat or vegetables with stock, milk, or water. Hot soups are additionally characterized by boiling solid ingredients in liquids in a pot until the flavors are extracted, forming a broth. Soups are similar to stews, and in some cases there may not be a clear distinction between the two; however, soups generally have more liquid (broth) than stews.
Asparagus soup
Soup (William-Adolphe Bouguereau, 1865)
An advertisement for Campbell's canned soup, c. 1913
Instant soup in a powder form