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Viscosity is a key property in fluid mechanics that describes how easily a fluid will flow. The video starts by defining viscosity using Newton's Law of Viscosity, that describes the linear relationship between the shear stress in the fluid and the strain rate, and how it relates to the dynamic and kinematic viscosities. It also explores how viscosity is dependent on temperature - the viscosity of liquids reduces with increasing temperature, but for gases temperature has the opposite effect. Another interesting aspect of viscosity that's covered in the video is non-Newtonian fluids, like shear thinning or shear thickening fluids, for which the relationship between the shear stress and the strain rate is non-linear.

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