Now a days webmasters using search engine marketing (SEM) techniques (for ex: PPC) for getting visitors to their website like google adwords, yahoo search engine marketing i.e. paying money to the search engines for a click on a targeted keyword which appears in sponsored results (apart from organic search engine results these results will appear in top (or) right side of organic search engine results) of search engine results and google ads that we generally see in websites.

Why Click Fraud:

For ex: Google Adwords
By using google adwords webmasters request to put google ads in their website for generating revenue. Google will pay the webmasters for the impressions of google ads and clicks on google ads (google ad in the sense the website displayed in the google ads).some webmasters for earning money from google ads they themselves click on google ads this is called click fraud.

How google Identify Invalid Clicks?

Detection and Filtering Techniques:
Each click will be checked by Google by considering the following criteria

• Which keyword and URL has displayed in the website
• At Which time the ad was displayed
• Web site visited from which city, region, country, IP Address the click has come
• Invalid Clicks and impressions from known sources are automatically discarded

Google consider the following clicks as invalid or fraud clicks:

• Manual clicks that are to increase the profits of website owners
• Clicks from robots (or) specially designed software for clicking purpose.
• Double Clicks

Click Fraud Disadvantages:

If Google found the invalid clicks the adwords account (service of Google to do search engine marketing (or) to run a PPC campaign) will be banned by Google and sometimes the website will get banned by Google.