As explained above a vector is often described by a set of vector components that add up to form the given vector. Typically these components are the projections of the vector on a set of mutually perpendicular reference axes (basis vectors). The vector is said to be decomposed or resolved with respect to that set.In vector calculus divergence is a vector operator that produces a scalar field giving the quanvectory of a vector fields source at each point. More technically the divergence represents the volume density of the outward flux of a vector field from an infinitesimal volume around a given point.. As an example consider air as it is heated or cooled.
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