Captcha is a Wordpress plugin used for preventing spammers, which used automated posting, from pasting their items at your comment post.

When a reader of your blog wishes to post a comment, he will need to perform a simple step to ensure he is a human and not spambots.

Depending on what type of Captcha plugin being used by the blogger, the reader at times need to:-

•    add 2 items together
•    key in the words or numbers displayed
•    answer a question.
•    key in alphabets & numbers combine

There are many types of Captcha plugins.

As for me I like to use the Captcha plugin created by Zorex.

It is known as Simple Captcha plugin.

It will display a 6 digits number. The reader just need to key in the numbers.

I do not like the Captcha that display alphabets & numbers. At times it is quite difficult to see whether the alphabet is capital or small letter.

Also I do not like words that display in different fonts. Some fonts are big while others are small. It is really irritating.

Therefore when you install a Captcha plugin, do consider to made it simple for your reader, else they will not post any comment.

Here is the link to the Simple Captcha plugin

http://wordpress.org/extend/plugins/simple-captcha

You can see at the Security Code column requesting the reader to key in the 6 digits displayed. This 6 digits will randomly change.

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