Examples of the use of site and filetype of search engines

Let's introduce two things today, Site and Filetype.
Site

Site believe that many people know, you can limit SEO search engine domain name range, you can simply say that in-site search, usage:

site:111cn.net keyword
Key word site:111cn.net
Site:111cn.net

Many of the sites included in the site to use as a site search, if you want to search a site but did not find the search box can be used this method.

Filetype

I do not know if you have been on the Internet to search for PPT, anyway, I was looking for a lot, looking for these things are very skillful, PPT (including other formats) of resources online is very many, good at using search engines can find good reference materials.

Filetype can help us search for content in a qualifying file format:

Filetype:ppt Mathematics
Math Filetype:ppt
Filetype:ppt

PS: And this method Google in the domestic somewhat chicken.

Baidu support format: ppt, XLS, doc, RTF, pdf

Google support format: ppt, XLS, doc, RTF, SWF, PDF, KMZ, KML, PSD, def