Content spam, means stuffing as many keywords as you can in the content oer and oer again. Google will hate your site, and your rankings will suffer.

Try to be conservative, do your keyword research and also use longtail keywords for variety.

The basic rule is don't spam. I suppose you nee dto know what it is to avoid it though. Do you mean content spam or spammy content?? Not sure if there is a difference though.

content spam is an problem comes when you steal other content in your website links , content should unique and your own ,

It's A copied content with to much keyword stuffing called content spamming. Use copy scape for content refine and remove unnecessary keyword use only targeted keyword 4to8 time in 500 word.

Spam means same page already match. However spam content is the content which is copied from some other exist page on the market i.e on the internet.

Content spamming mean same content repetition on many site is called content spam.

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when you comment anywhere for building backlink will be comment spam. When you comment anywhere only for your impression will be ok

Sohel, doesn't that make your comment spam?

use common sense when you try to decide whether there are too many keywords repeated

Content spam means exactly that, your content is so full of unreal sentences and overly stuffed keywords that the humans and SE find it unrealistic and just leave the page or rate it badly. It should be avoided or else your site would be punished.

Same type of content on all pages, other websites, copy some others content, submit same content in various sites can be counted as content spam

Very poor content and submitted to different article directory!

Well content spam means using the keywords more than 5 times in your content which is called keyword stuffing.