Do you mean that you want to transfer "pictures" from the lappie to a reader so that you have them on file for whatever? Then yes you can. A lot depends on your system and the SD card of course. I did it some time ago but cannot remember the exact process but this may help.
A memory card functions as an external drive, in the same way that a USB memory stick does (and, indeed, other devices, such as your mobile phone or an MP3 player).
You can 'drag & drop' or 'copy & paste' files freely in either direction.
^^^ A USB card reader is little more than a socket to hold the card (in the same way that a USB port is just a socket to plug a memory card into). It has no active parts (unlike a CD drive which needs a laser built into it in order to write to discs). You can both read and write to any card that's inserted into it.