A cookie is a small text file that a website requests to save on the visitor's computer. Cookies are used on many websites to give a visitor access to various features. The information in the cookie can also be used to track a user's browsing of websites using the same cake.
There are two types of cookies. One type saves a file for a long time on the visitor's computer, then the cookie has an expiration date. For example, it uses features that tells what's been updated on the website since the user visited the site last time. When the expiration date is passed, the cookie is deleted when the user returns to the site that created it.
The other type of cookies is called session cookies and lacks expiration date. While a user is browsing a web page, this cookie is temporarily stored in the user's computer's memory, for example, to keep track of which language the user has chosen. Session cookies are not stored for a long time on the user's computer, they disappear when the user closes their browser.
Google Analytics Opt-out is a browser plug-in. When you have Google Analytics Opt-out enabled in the browser, no information is sent to Google Analytics. This is a global opt-out for Google Analytics that applies to all sites using Google Analytics.