Downloaded Files

[Angel]

When I going to install new software from Applications>Add/Remove
Applications,and after selecting the package,when the download starts,it
shows the massage ¨The package files will be cached locally for
installation¨.
Can any one tell me,where this files are downloading?i mean,in which
location?i want to copy those in other places.then later i can install
the software without internet connection.
Can any one know the location?