There are many types of adverts that can sit on your web site. Here's a list of the most popular forms:

Many guide users will see the descriptions given here and realise just how annoying, irritating and off putting these adverts can be. Having adverts that appear
before content is very frustrating, and having an advert dressed up as a dialog or error message is deceiving and extremely rude to your users. Many regular web
users have developed an ability to ignore most website adverts so their effectiveness can certainly be questioned in many instances.

Source: Online advertising

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