CS pin on catalex.taobao.com data logger

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hi:
i'm trying learn how data arduino uno data logger circuit bought catalex.taobao.com.  in case, want store temperature data on micro sd card.  circuit has 6 inputs on it.  cs, sck, mosi, miso, vcc, , gnd.  understand circuit input functions except cs.  i've gotten definitions of others discussions of data logging in forum.  thing can imagine cs is data logged.  can direct me more complete discussion of data logging mechanics or explain cs input me.  much.  i'm using tmp 36 temperature sensor input uno.  hope can help.
bob

cs stands chip select.

this pin becomes important when have multiple devices on spi bus. way, master can choose slave talk sending logic high cs of 1 slave in question , logic low of others.

it works enable pin.


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