Sea salt, obtained by evaporating seawater, is used in cooking and
cosmetics. Historically called bay salt, its mineral content gives it
a different taste than table salt. Kosher salt is one of the most
commonly used varieties of edible salt in commercial kitchens today.
Kosher salt has a much larger grain size than regular table salt, and
a more open granular structure.

Kosher salt gets its name not because it follows the guidelines for
kosher foods as written in the Torah but because of its use in making
meats kosher, by helping to extract the blood from the meat.

Both consist of the chemical compound sodium chloride.

Kosher salt is characterized by its big crystals with large surface
areas. The crystals in sea salt are not as big as kosher salt and are
in pyramid shape. Kosher salt's size and shape allows it to absorb
more moisture than other forms of salt.

Kosher salt is made by evaporation process. However, some processes
allow their crystals to grow at normal atmospheric pressure which
makes a different shaped and larger crystal possible. In other
manufacturing processes, Kosher Salt is made by compressing table salt
crystals under pressure and then sizing the resulting agglomerates to
yield a coarse-type salt. Sea salt is produced by evaporation of sea
water at atmospheric temperature and pressure. The crystals tend to
form inverted pyramid shapes not all that different from Kosher Salt
produced at atmospheric pressure referred to in the first paragraph.
Depending upon the geographic location, altitude, and composition of
the salt ponds from which the salt originates, the salt may take on
certain colors representing some of the trace minerals in the area.

Sea salt and kosher salt possess large, irregular grains that add a
delightful crunch and hit of briny flavor when sprinkled on food at
the last minute. Generally, savvy cooks prefer kosher salt when
cooking, since its coarse texture is easier to take a pinch of when
seasoning savory dishes. Kosher salt is used for curing meats and also
for baking with recipes that use small amounts of liquid. Sea salt is
also used in cosmetics.