What are Cookies
Cookies are tiny files that are downloaded to a hard drive on your computer or other device. They help to see how the website is used, hence they help to improve users experience and remove any bottle necks. Some cookies remember your selections (ie. order of products), some are necessary to login or use a shopping cart. There are also so called third-party cookies. One of the most commonly used is Google Analytics which provides anonymized website statistics.
One of the ways to manage or completely block cookies (some or all) is via your web browser. Every web browser (Chrome, FireFox, Edge) has a settings menu where you can change cookies settings.