Well, no! Not all websites!
For example, here on the Hampden website, we didn't need any cookie technology to be installed, nor any other technology used to personalize the visitor's experience on the website, to remember your preferences or to present you with "relevant" advertising.
So, what are these "cookies" we're increasingly being asked to accept or reject on almost every website we've been visiting for some time now?
It's a governmental law that follows this worldwide movement born of the use of "cookies" that can be perceived as intrusive in terms of personal data confidentiality, due to the fact of only visiting or entering personal data on certain websites, depending on the use of the latter.
Other cookies are used to personalize the visitor's experience with "relevant" advertising or the ability to remember visitors' preferences.