What are the tools for information retrieval?

1, FTP (File Transfer Protocol) type of retrieval tools.

Set of standard protocols used to transfer files over a network, using the client/server model. It belongs to the application layer of the network transfer protocol. The difference between file transfer and file access is that the former is provided by FTP and the latter is provided by applications such as NFS.

2. Menu-based search tools.

This type of retrieval tool is a distributed information query tool, it will automatically convert the user's request into FTP or Telnet commands, in the first level of the menu guide, the user can select their own interest in information resources.

3, keyword-based search tools.

Keyword Tool (Keyword Tool abbreviated KT) is based on a variety of customer needs, to provide customers with a choice of keywords, so as to better locate potential customers a powerful assistant. It is like a good fishing net to help customers from the vast sea of words to salvage the right customer keywords.

4. Hypertext-based search tools

The famous www is a hypertext-based information query tool, located in the world's Internet sites on the relevant database information organically woven together to provide a friendly interface to the information query interface, the user only need to put forward the query requirements, as to where and how to query query are automatically completed by Www.

5, multi-dimensional search engine.

Search engine refers to a class of websites on the Internet specializing in providing retrieval services, the server of these sites through the network search software or network login, etc., will be a large number of web sites on the Intenet page information collected locally, after processing the establishment of an information database and indexing database, so as to respond to a variety of searches proposed by the user, to provide the user with the information they need or the relevant

Baidu Encyclopedia - Network Information Retrieval Tool