Depends upon type of spamming you want to know. Get more info here - http://en.wikipedia.org/wiki/Spam_(electronic)
Spamming is utilizing any search engine ranking technique which causes a false quality in the results produced by search engines. Common spamming tricks are: 1) Excessive repetition of a keyword on a web page 2)Optimizing a page for a keyword which has nothing to do with the contents of the site 3) Using invisible or tiny text in order to stuff more keywords in 4) Creating false doorway pages that hide more keywords
Spamming is the act of posting a message to many people at once. Usually there is some sort of profit motive behind the message.
There are many types of spamming, such as keyword stuffing, email spamming, even forum spamming. You should check out the guidelines here to get an idea of what is not allowed on the forum, if it's not allows then its a form of spamming, ofcourse this only applies if you are trying to make a profit. At least thats how i understand it.
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Spamming is an unethical way of posting a large number of links, in order to get an instant gush of traffic. In the long run it could be very harmful to the rankings of your site. Your site could even be banned by the major search engines.
Unsolicited mails are meant spamming. All those email which you think rubbish in your inbox and wish not to receive in future, is spam. For example, you find various mails selling and advetising some medicine, or you are informed that you have won a lottery, all are under spamming. They cheat people.
Spam is flooding the Internet with many copies of the same message, in an attempt to force the message on people who would not otherwise choose to receive it.
There are several different meanings for "spam." I think anything that isn't relevant to a certain page, if they content isn't related, I would consider it spam. If I came to this discussion and I started talking about Pizza, trying to sell shoes, or anything else off the topic of answering what spam is, that is what I would call spam.
"Hello. I have come across your blog and must say it is outstanding! Really top notch work here. Is it Wordpress? I will definitely bookmark your amazing blog and come back again and again. Thank you for your wonderful contribution to this subject!!!!" I can't tell you how many times I see comments like these on blog posts.
well dear spamming is the thing that you are doing your against Google's terms and conditions like excessive keywords or description or title in Metas or doing illegal work like black hat seo and many more things are countable in spamming. so avoid spamming and do your work according Google Panda updates. Regards: Jennifer Hudson
spam is the name of a magical dragon which breathes gold-plated cornflakes to pixies from the planet Arse