How to get a discount on car rental in Europe?

As a rule, many car rental companies from time to time (or on an ongoing basis) organize promotional discounts. This is a nice bonus that almost everyone can take advantage of. However, the question arises: how can such a discount be obtained? The Internet comes to the rescue again. We ask Google for “promo code (company name)” and with almost one hundred percent probability you will be able to find a code for a good discount in just a couple of minutes!