Viscosity, a measure of the resistance of a fluid which is being deformed by either shear stress or extensional stress. In
general terms it is the resistance of a liquid to flow, or its "thickness". Viscosity describes a fluid's internal resistance to
flow and may be thought of as a measure of fluid friction. Thus, water is "thin", having a lower viscosity, while vegetable
oil is "thick" having a higher viscosity. All real fluids (except superfluids) have some resistance to stress, but a fluid which
has no resistance to shear stress is known as an ideal fluid or inviscid fluid. For example, a high viscosity magma will
create a tall volcano, because it cannot spread fast enough; low viscosity lava will create a shield volcano, which is large
and wide. The study of viscosity is known as rheology.

Source: WikipediA
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