What does FDTD stand for?

FDTD is a electromagnetic tool for analysing various structures. It is fully called a s finite domain time domain. U go on net dedicated sites are there on it where u will get abundant resources on it

The finite difference time domain (FDTD) approach is rapidly becoming
one of the most widely used computational methods in electromagnetics. There
are several reasons for this, including the increased availability of low cost but
powerful computers, and increasing interest in electromagnetic interactions
with complicated geometries, which include penetrable dielectric and/or magnetic
materials. Just as important perhaps is the extreme simplicity of the
method. The fundamentals of FDTD can be grasped easily by undergraduate
students, more easily than traditional frequency-domain approaches to
electromagnetics. Yet FDTD is capable of computing electromagnetic interac-
1 tions for problem geometries that are extremely difficult to analyze by other
methods. It is this combination of simplicity and power that makes FDTD such
a popular method.