Is this happen with my website? Answer is yes, if your website gain good ranking in search engine then you competitors may sabotage your natural ranking with Negative SEO. Negative SEO require good understanding of search engine algorithm and search engine rules.
So, we can divide SEO into two types

1. Constructive SEO and
2. Destructive SEO

How this destructive SEO tactics harm your website ranking?
Search engines like Google, Yahoo and MSN depend on number links to a website from partners' website. This rule is simple to understand: "If you have more link back website pointing to your website then your chances of getting higher ranking in search engine is more". Many webmasters and SEO companies use software that submits your website in thousands of search engines and directories. If your website is fresh website or even old one and you receive thousands of links back in a short period then it will not count in natural linking but consider in artificial linking. Search engine may consider this as a Link Spamming and may banned or sabotage your website ranking. This applies in negative SEO tactics, if you competitor do same for your website then your website ranking will be affect.

Here are different ways to sabotage your natural ranking.

(1) Google Bowling
(2) Tattling
(3) Google Insulation
(4) Copyright Takedown Notices
(5) Copied Content
(6) Denial of Service
(7) Click Fraud

Matt Cut a Senior software developer for Google clearly written that its not impossible to sabotage natural ranking by pilling unrelated links for competitors website, but this is extremely difficult to do. He wrote "I won't go out on a limb and say it's impossible. But Google bowling is much more inviting as an idea than it is in practice."

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