Emails often contain links to web sites. But when you click on them, they don't always take you where you thought you were going. There are various ways to falsify URLs or at least to hide them. This test email demonstrates a few of them.
These tricks are used, for instance, to collect account information or access data to eBay. Tricksters send out falsified emails, for instance, that look like they are from Citibank and ask recipients to enter their account number, password, and similar information at a web site.
Never rely on URLs that you get by email. It is better manually to enter the URL that you want to visit or select it from a list of favourites, especially if important data is concerned - even if that takes a few more mouse clicks.