Search engines⑦

　　Search engines are a type of computer program. The links that you get⑧ are not classified⑨ by subject. These engines search the Internet for you based on the key words you type⑩ in, and choose web pages⑪ for you which contain the words you ask for⑫. The contents they search have not been evaluated⑬. This means that the information has never been checked - it could be reliable⑭， true information or false⑮ information written by a person without qualifications⑯ or someone who does not have solid⑰ facts. The links you obtain from the search engines⑱ go to full articles or pages. This requires you to be⑲ patient as you have to read the information to decide whether it is linked to⑳ what you are researching. Examples of famous search engines are Google, Yahoo and Baidu. You can also go to the www. thesearchenginelist. com website and check their list of search engines.

　　Subject directories

Subject directories are built by humans. Someone has combed\s\up1(21(21) through pages and links and selected all those that are in the directory\s\up1(22(22). The results of your search are divided into specific\s\up1(23(23) subject categories\s\up1(24(24). You do not get the full pages to read. Instead, you get a bunch of\s\up1(25(25) titles of articles or pages and, sometimes, a short summary of the information they contain. You need to decide whether the information is useful to you\s\up1(26(26) on that basis\s\up1(27(27). Most often, the information in subject directories has been evaluated, and someone has decided that the information is