Cookies and other tracking technologies are comprised of small bits of data or code that often include a de-identified or anonymous unique identifier. Websites, apps and other services send this data to your browser (on your computer or mobile device) when you first request a web page and then store the data on your computer so that such websites, apps and other services can access information when you make subsequent requests for pages from that service. They are widely used in order to make websites work, or work in a better, more efficient way. For example, they can recognise you and remember important information that will make your use of a website more convenient (e.g., by remembering your user preferences).
If the cookies are deleted, you will be logged out of the system and lose state information. The application will of course continue to work.
Most browsers accept cookies automatically, but you can alter the settings of your browser to erase cookies or prevent automatic acceptance if you prefer. Generally, you have the option to see what cookies you’ve got and delete them individually, block third party cookies or cookies from particular sites, accept all cookies, to be notified when a cookie is issued or reject all cookies. Visit the ‘settings’, ‘options’ or ‘preferences’ menu on your browser to change settings.