Cookies on Pages help you and they track you. That is the time we live in one gives up on one’s privacy for some convenience. If I visit my favorite Webshops I do not want to get offered products I either already bought or I have no interest in. That is what cookies is for as well.
The EU is having some ideas about how people visiting a page have to be informed and some countries have some ideas how to interpret this. To be on the safe site, I suggest some advice from a lawyer for media law. If you have a webshop or just for safety reasons, there are a few plugins to make the cookie disclaimer easy for you – I suggest: Cookie Law Info oder EU Cookie Law.
On the other hand, if you are a visitor from a web page and don’t want to be tracked I highly recommend the use of an ad-blocker and „Ghostery“ an amazing Browser extension available for most browser.
I guess you are like me, you want to decide who tracks you when – I suppose you should give it a try. As you can see you can easily decide and switch off the trackers or whitelist pages.