Types of AdSense

There are 4 products of AdSense. There are ad units, ad links, adsense for search, and referral.
We can put maximum 3 ad units, 3 ad links, 2 Google AdSense for search, and 3 referrals on a page. Like you see on this page, there are 3 ad units (2 ad images on the left, and 1 on the bottom), 2 ad links (under the header’s banner and on the footer), 1 Google AdSense for search, and 3 referrals (those ads for AdSense, AdWords, and Firefox with Google toolbar).



-Ad Units
Actually it could be displayed as text links or images. But I myself prefer as images. Well, it could be different in every case, but in my case on my blog (http://orenoanime.blogspot.com), the images are more eyes-catching and that makes people more interested to click it. You should test it by yourself, to know what kind of ad units are more suitable for your site (so, if you have blogger, just copy the code like usual (from the adsense site), instead use the instant way provided by blogger, so that you can add a channel on it.). I use the wide vertical skyscraper more because I use blog. People are usually scrolling down to read my content. I use the large square too, because people said that it has the most click rate

Usually the most effective placement is on the left sidebar on above.

But if keep this in mind:
-Wide is always better, regardless it is vertical or horizontal.
-No border!

But this is the most important thing: You don’t want your ads look like ads! You want the ads look like additional information for your content!

It’s not like deceiving people. But nobody interested in ads (just before they know what the ad is talking about). So you want to make them interested with the ads!

-Ad Links
Well, I myself don’t like it. I have never seen the power of ad links. With minimum information, and limited space, I never think people would click it. But I think there is nothing wrong with optimize it.

Just like I said before, wide is always better, and no border!

-Google AdSense for Search
Why do we put search box on our sites? Of course, it’s because it makes money. But why search?

Most likely our sites don’t provide every single thing. There must be some visitor who come to our sites and didn’t find what they’re looking for.

That’s why we provide a search box.

Just like usual, no border!

Where should we place the search box? Some people put it on left above, right above, or on the bottom. You should test it, where is more suitable for your site.

-Referral
This one is not paid per click. It only gives you money if the visitors do a certain thing with the products (for example downloading, or signing up).

You might receive payment 1 time every year.

Some people trying to optimize it by writing some article related to it