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Thank you all for your great answers, the aim of the question was to show the weakness of using cookies as data source to understand website visitors behavior and that will be:
Cookies only identify machines ( they do not identify people unless you have some way of tying that cookie information back to a specific person.)
Thank you
Allowing Hackers to find a gateway to get the data transferred through the cookies
Its kinda not clear here who is using the cookies, you have both the user behind the screen and the developer of the web application..
if we are talking about the user (not the developer) the biggest drawback of enabling cookies here is the privacy concern, it helps data to be intruded, in best cases by advertisers and worst cases by those who want to know more about you for evil purposes.
As a developer ... cookies have magnificent importance however a developer should not rely heavily on them since users can either disable them or delete them , thus a major loss of the functionality of the site. Also cookies exists as a plain text on the client machine allowing anyone to manipulate them which introduces a security risk.
you can benefit from a similar question asked here on bayt.com : http://www.bayt.com/en/specialties/q/82346/what-help-do-we-get-from-internet-cookie/?feed=answers#answer_277431
Cookies occupy storage space
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