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Cookies are NOT programs, they do not do anything at all. They are simple text files that can only be read by the web site that put them  there, and by you on your local PC. In the main they are used to store your user id and name for a particular site, in addition, sometimes the date and time you last visited, and how many times you have visited.
There is no great secret or anything exceptional about the information gathered by cookies, you can view the contents of those on your PC in Notepad.
A cookie cannot be used to get data from your hard drive, get your email address or steal sensitive information about your person.
Parts of our website need cookies in order to function properly. By continuing to use the SPE Contracts website, you agree that we may place cookies on your device. It is your right to turn these off if you wish but you may find that the website will not work as expected and you may not be able to take full advantage of some of the website’s features.
Managing your Cookies:
If you wish to manage the cookies on your PC or even block them for some or all sites, detailed below are the help documents from the major browser companies.
Cookies