FTP (File Transfer Protocol) is a protocol for transferring files on the Internet. It is a file transfer standard for us to transfer files to each other on the Internet, which stipulates how to transfer files on the Internet. In other words, through FTP protocol, we can upload or download files on the Internet with FTP server.

Like other Internet applications, FTP is a concept that depends on the client/server relationship. There are some websites on the Internet that provide services according to the FTP protocol and allow netizens to access files. These websites are all FTP servers. Users on the Internet need to use the client software of FPT if they want to connect to the ftp server. Usually, Windows has an "FTP" command, which is actually a command-line FTP client program. In addition, the commonly used FTP client programs are CuteFTP, Ws_FTP, FTP Explorer and so on.

To connect to the FTP server (that is, "log in"), you must have an account of the FTP server. If you are a registered customer of the server host, you will have an FTP login account and password, and you can use this account password to connect to the server. But a large number of FTP servers on the Internet are called anonymous FTP servers. The purpose of this server is to provide file replication services to the public, so users do not need to register with the server in advance.

Anonymous file transfer enables users to establish a connection with a remote host and copy files anonymously from the remote host without having to be a registered user of the remote host. Users can use special user names "anonymous" and "guest" to have limited access to public files on remote hosts. At present, many systems require users to use the address of Emai 1 as the password for better follow-up access. For security reasons, most anonymous FTP hosts generally only allow remote users to download files and are not allowed to upload files. In other words, users can only copy the required files from the anonymous FTP host, but not to the anonymous FTP host. In addition, the anonymous FTP host also adopted some other protection measures to protect its files from being modified and deleted by users, and to prevent the invasion of computer viruses. Before the popularity of the WorldWild Web environment with 1995 graphical user interface, anonymous FTP has always been the most important way to obtain information resources on the Internet. Thousands of anonymous PTP hosts on the Internet store countless files, which contain all kinds of information, data and software. As long as people know the host address of a specific information resource, they can use anonymous FTP login to obtain the required information. Although WWW environment has replaced anonymous FTP as the most important information query method at present, anonymous FTP is still the basic method to transmit and distribute software on the Internet.

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