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Two main types of flow are encountered in fluids

Laminar Flow:

Laminar Flow is a flow which can be separated into layers or streamlines. It is a flow in which adjacent lamina (streams) do not split apart unless it is due to a non-fluid obstruction (such as a split in the pipe, etc). Laminar flows tend to be slower and more viscous than turbulent flows, and the pressure tends to be more smooth within a laminar flow.

Turbulent Flow:

Turbulent flows are highly irregular and chaotic flows. Turbulent flows usually contain at least one vortex. Large differences in velocity between neighboring streams causes a turbulent flow to dissipate energy quickly.

Turbulence is an unsolved problem in physics, as the Navier-Stokes equations have yet been solved for three dimensions.