Many find it difficult to search engine spiders crawling on the site of a lot of code. Most of these codes are not really necessary, but the webmaster to them, because they believe that it can improve the visibility of the website. However, the spiders actually have a hard time analysis unnecessary code website. Important thing is that you can only put you need anything, you only add a script when you really need them. meta description is brief remarks appear in the search results, which is located in the following main components. This is very important, because these also the file index of the search engine. The search engine first thing is, if you can, it will increase the visibility of a website. Just remember that these labels should be limited to 160 characters, so it fits the description area on the search results page.