Google ad sense is a way for website owners to earn additional revenue from their website by displaying Google ads on their website
. These ads are taken from the content network from Google which is targeting specific viewers and placing ads that they may be interested in right in front of their eyes. Any website owner can display Google Ad Sense on their website but in my opinion I believe that they are more effective on informational websites rather than a company / corporate website. It doesn't really look too professional if you are trying to promote your business on your website and you have banner ads and Ad Sense on your site as well. This can make a web page look too condensed, confusing and may take away the focus on your particular product or service offering.
I would highly suggest displaying ad sense on a website that is mainly built for the sole purpose of generating revenue from advertising rather than trying to promote a service or product. I am not saying that it isn't feasible but in many cases I haven't seen it done in a manner that hasn't taken away focus from the websites main purpose.
In conclusion ad sense can be very beneficial to a website owner depending on the strategy used by the webmaster and also the placement of the ads. As long as it does not take away focus from what your websites intentions are Google Ad sense can be a great additional revenue stream if implemented properly.