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[ngochocly]

The FDTD method applies a set of simple central-difference approximations for the space
and time derivatives of electric and magnetic fields that are second-order accurate directly
to the respective differential  operators of the time-dependent Maxwell’s curl equations,
instead of potentials, and therefore, achieves a sampled-data reduction of the continuous
electromagnetic fields in a volume of space and over a period of time. Overall, the
FDTD technique is a marching-in-time procedure that simulates the actual wave in the
finite space lattice by the analogous numerical wave propagation stored in the computer
memory.