Cookies are text files which are placed on your computer or other devices when you visit a website.
Different types of cookies:
Session cookies are temporary cookies that expire at the end of a browser session, i.e. until the user leaves the website.
Persistent cookies in contrast to session cookies are stored on the computer between browsing sessions until expiry or deletion.
Performance cookies collect information about the use of the website, such as visited pages or any error messages. They do not collect personally identifiable information, and the information is collected in an anonymous form. Performance cookies are used to improve the functionality of the website.
Functionality cookies allow the website to remember any choices you make during a session (such as changes to text size, customised pages) or enable services such as commenting on a blog post.