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<div align=justify> Security should be considered as one of the most important aspects when choosing a web hosting provider. Lack of security may lead to data loss, site downtime, and a reduction of traffic level. One of the most popular security issues is spam. Although web hosting providers offer integrated tools specifically designed to prevent spam, there are certain measures that can be taken from the site owner's side to completely eliminate spam.


* '''''Why should spam be prevented?'''''

Spam can have negative impact not only on the site security but the whole business productivity as well. High quality content that being constantly updated makes visitors gain interest in your site, therefore making it successful. However, spam comments and low-quality content placed on your site will possibly result in significant traffic and search engine rankings reduction. It is even possible to get excluded from some search engines due to excessive amount of spam on your site. Another form of spam is automated e-mails submitted through contact forms on your website. They may overcrowd your inbox, and a lot of time will be needed to delete them. The result of this may be reducing of productivity and lowering the responsiveness of your customer service.

* '''''What is captcha exactly?'''''

Captcha is a script that is installed on your website. It displays a unique image with a random combination of characters (including letters, numbers, and symbols), and visitors must input that combination into a form box to verify that they are human beings,not automated robots. Since these unique images are generated randomly, bots are unable to read or decode them (unlike regular text). Images cannot be viewed and interpreted by computer programs, so captcha scripts are an effective way to prevent spam and ensure that all emails sent to you or comments left on the site are from a human being.

* '''''How to use it'''''

To use a captcha script you just need to insert the code snippet into the coding of any form you have on the site. The script will randomly generate a captcha image each time the form is accessed. The visitors will have to enter the combination generated by captcha script in order to send the email. Captcha codes are a flexible and highly effective spam prevention tool that can be placed on any web site.
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