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You are being tracked on the Internet no matter where you go unless you are very careful what you do and also in regards to your data.
One common form is email tracking. This is being used to verify that a recipient has opened the email at the very least. Depending on the tracking methods used, it may provide additional information, for instance if a link was accessed or an image displayed.
The two most common methods used by trackers are links and remote contents. If a recipient clicks on a link, it is not only clear that the email has been opened, but also that the user visited the linked website or service. This may reveal additional information such as your IP address or operating system version.
The second method uses remote contents, images for example. Many email clients block these types of content by default to improve user privacy.
What most email users may not know is that there are additional means to track emails.