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s to decrease the transaction cost and raise the customer satisfaction. Compared with B2C mode, B2B has obvious advantages in sales figures and sales area coverage。 it is more meaningful to Emerce development. Business English Letter Task 2 Learn some knowledge about search engine ? Brief introduction ? When panies or individuals perform their emerce activities for advertising, selling, buying and distributing products, they have to realize them by some tools. Emerce tools include puter and inter, search engine and database, domain name and website, etc. One can do most things in front of his puter talking through his microphone as well as typing to municate with his customers and getting business information. Business English Letter ? What is a Search Engine? ? A search engine is a searchable online database of inter resources. It has several ponents: search engine software, spider software, an index (database), and a relevancy algorithm (rules for ranking). It searches documents for specified keywords and returns a list of the documents where the keywords were found. Although search engine is really a general class of programs, the term is often used to specifically describe systems like Alta Vista and Excite that enable users to search for documents on the World Wide Web. ? Typical famous search engine websites are and (for Chinese users ). Following are some knowled