Cookies are files whose sole purpose is to simplify and improve your navigation on websites. They are in no way harmful to your computer nor can they contain any type of virus as they are not active files and are very small. 

If you prefer not to allow cookies, you have the possibility of deactivating them in the internet browser (browser) you use, bearing in mind that some of the pages may not be displayed correctly and you may not have as satisfactory a navigation.