Baidu is a famous search engine and number one traffic ranked site in China. Baidu predominantly offer searches in Chinese and also offer English searches in partnership with Bing. If you are targeting users in China or your website is having pages in Chinese then it is a great idea to use Baidu custom search box in your site..
nginx [engine x] is a HTTP server and mail proxy server written by Igor Sysoev.
Meta descriptions are HTML attributes that provide concise explanations of the contents of web pages. Meta descriptions are commonly used on search engine result pages (SERPs) to display preview snippets for a given page.
Meta Keywords are a specific type of meta tag that appear in the HTML code of a Web page and help tell search engines what the topic of the page is.