We're protecting the Internet from spammers. Therefore, we're asking you to confirm that you're not an automated computer program used by a spammer to send us spam. If we didn't do this, a spammer's computer program might be able to use our form to send spam to us. This costs us a lot of time and effort.
People are smarter than computers, so, we're asking you to enter the text you see in the image because a computer program probably can't do that. By entering the text you see, you're helping our server confirm that you're a real human being and not an automated computer program.