Cookies are the text data stored in your devices for the various kinds of purposes, for example to save your preferences and data. It simply costs some of your device storage (with browser standards), but it helps alot to us to make the most user interactive and effective website.
Foewa.com is obeying cookies laws of EU by showing a banner of agreement that we are using the clients' cookies. And also user can reject or accept to use their device cookies.
Cookies are stored by the browser application that you installed, you can clear it by the way provided by the browser.