can anyone explain more about median filtering?

can anyone describe this coding below. actually this coding is for
median filtering. but i cant understand line by line the coding. i too
beginner in image processing. please help me

%Median filtering
mf = size(H);
for m = 0:1:mf(1)-3;
for n = 0:1:mf(2)-3;
for i = 1+m:1:3+m;
for j = 1+n:1:3+n;
c(i-m, j-n) = H(i,j);
end
end

for i= 1:1:9;
cc(i) = c(i);
end

med = median (cc);
H(2+m, 2+n) = med;
end
end
.

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