express card slote

[Green ViruZ]

i have a toshiba satellite l300 1fr laptop, its has a express card slote , whats the use of that ,

 

[rgd1101]

for something like
http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&DEPA=0&Order=BESTMATCH&Description=+ExpressCard%E2%84%A2+slot&N=-1&isNodeId=1