Cookies - why we use them

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Cookies are basically small  files, they ask you if you will allow permission for them to be placed on your hard drive. Once agreed a tiny file is added.

They help to draw up analytical data  looking at web traffic, once agreed on a particular site it remembers you.

When you allow cookies, the  web applications will respond to you individually.  Which  can offer you personally suited information. 

So in a nutshell, by using cookies, they will gather and remember your preferences which means you can receive tailored information as the 'Clever Cookies' remember your likes and dislikes.