Domain and URL

Simply put, that is: The URL is composed of domain names such as www.sina.com.cn URL by the protocol + domain name composition. such as: http://www.baidu.com This is a URL, the front is the http://protocol, behind www.baidu.com is the domain name. Domain name is used on the Internet to find the name of the site, is an important sign on the Internet, the equivalent of the host's house number, in the world, there is no duplicate domain name. The first step for companies to get online is to apply for a domain name for their company. For example: The domain name of CCTV is www.cctv.com, the domain name of Dragon City Hotline is www.ty.sx.cn, this is the website that we often say. Domain name is the name of an enterprise or organization on the Internet, also known as the Enterprise Online trademark. International domain names (domain names ending in. com,.net) and domestic domain names (domain names ending in. cn). International domain name is divided into international English domain name (such as: www.longcity.net;www.163.com) and international Chinese domain name (such as: Dragon City. Net; Sina. com). Domestic domain name is also divided into domestic English domain name (such as: www.sina.com.cn) and domestic Chinese domain name (such as: www. Dragon City. com.cn or www. Dragon City. cn). In accordance with the provisions, the domain name suffix represents the nature of the business or service as follows:. com used for commercial organizations or companies;. NET an organization or company that is used for Internet-related network services; org is used for non-profit organizations, groups, and individuals usually use. com. A domain name is made up of any combination of specific character sets, English letters, numbers, and "-" (that is, hyphens or minus signs) of each country's characters, but neither the beginning nor the end can contain "-". The letters in the domain name are not case-sensitive. The domain name can be up to 67 bytes long (including suffix. com,. NET,. org, and so on). For example: your-name.com is a qualified domain name, and www.your-name.com is the name your-name.com the hostname named www. The URL looks similar to the domain name, but adds a resource type in front of the domain name. A URL is an abbreviation for the uniform Resource Loctor, a unified resource Locator, a system that identifies where an information resource is in the Internet and addresses the services provided by the Internet uniformly. URLs can be reached anywhere to find what you need, such as files, databases, images, newsgroups, and so on, so to speak, URLs are address books on the internet. The URL is generally composed of three parts, each of which is as follows: 1. The server identifier can be determined by selecting the server identifier toThe type of server to access, the server identifier in the URL can have HTTP//, ftp://, gopher://, telnet://, nwes://, and so on, respectively, designated as Hypertext Transfer Protocol connection, File Transfer Protocol connection, Connect to a gopher server, connect to a Telnet session, and link to a Usenet newsgroup. 2. Information resource address information resource address is made up of two parts, one is the machine name, such as www.tsinghu.edu.cn is used to indicate the existence of the resources of the machine, the other is the communication port number, the connection is used when the communication port number. A port is a software identifier used by the Internet to identify a particular information service, which is set to an integer between 0 and 65535, typically using a standard port number, which can be used without writing. Non-standard port numbers are used when special services are required, and are then written, such as http://www.tsinghu.edu.cn:81. The Common Internet service port number, such as the standard port number for HTTP 80,telnet for the standard port number of 23,ftp, is 21, and so on. 3. Pathname pathname is the full file name of the resource on the machine in which it is given, typically only if the user knows where to find the resource. such as Http://www.tsinghu.edu.cn/index.hml and so on.

Domain name and URL