Search engines notice your site with different eyes than website users.
A web page that you think is appealing can be worthless to search engines. It is not important how fascinating and demanding your content is. Your attractive website won't be able to achieve high rankings in search engines. Because search engines cannot read the writing on your website's pictures, and some don't identify web languages such as CSS or JavaScript.
Normally, search engines cannot see website content displayed in the following file formats:
Images in JPEG, Flash movies, PNG format, GIF, Flash banners, etc. A few of these file formats are indexable by search engines. Getting higher rankings in search engines if your main website content is shown in these formats is difficult. They need content to index your website. Search engines are not familiar with the text on your JPEG or GIF images. If you are using pictures on your site, you have to put together web pages that include a lot of content.
A spider simulator tool simulates how search engines see your site. It will strip out the images, JavaScript, and Flash objects. And the tool will give you an idea of how the content looks to search engines. You just need to write down your domain name in the text area and see magic.