<strong>for /R %1 in (*.zip) do unzip "%1"</strong>
 
for - indicates that we are going to be using the for command
/R - recursively searches all sub-directories within the active directory.
%1 - the variable that will contain the filename that is found. This can be any number but it is case sensitive. If you want to use the for command in a batch file, you will need to use %% (e.g. %%z) instead of just %.
in (*.zip) - the search pattern that will be found. The portion in parenthesis uses the same wildcard scheme as the dir command.
do - indicates that the string following is the command that should be executed on each file found
unzip “%1” - the command that is executed for each file. The %1 portion is replaced by the name of the file found. So, for example, if the file found was archive.zip, the command that would be executed would be unzip "archive.zip".