DO is the action clause of the FOR command
FOR... %%G IN (...) DO ECHO whatever
FOR... %%G IN (...) DO Copy file1.txt file99.txt
FOR... %%G IN (...) DO Del %%G
FOR... %%G IN (...) DO call :s_subroutine %%G
“Confidence comes not from always being right but from not fearing to be wrong” ~ Peter T. Mcintyre