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Definitions from the Sharpened Glossary
UDP
Stands for "User Datagram Protocol." It is part of the TCP/IP suite of protocols used for data transferring. UDP is a known as a ?stateless? protocol, meaning it doesn't acknowledge that the packets being sent have been received. For this reason, the UDP protocol is typically used for streaming media. Though you might see skips in video or hear some fuzz in audio clips, it's better than having to wait for the delayed packets, causing the clip to completely stop.
Unique Visitor
A real visitor to a web site. Web servers record the IP addresses of each visitor, and this is used to determine the number of real people who have visited a web site. If for example, someone visits twenty pages within a web site, the server will count only one unique visitor (because the page accesses are all associated with the same IP address) but twenty page accesses.
Upload
Act of copying a file from a local computer to another remote computer (server) for wider distribution. Programs such as File Transfer Protocol (FTP) are designed to help users upload and download materials.
Uptime
The period of time while a server is switched on and your web site is available for viewing. Most servers are on almost continuously but all require switching off from time-to-time for maintenance.
URL
Abbreviation for Universal Resource Locator. URL gives a standard address for web resources. Every individual web page, for example, has its own unique URL which permits the browser to find that page. The browser reads the URL and goes to the page, wherever in the world it is located.
Virtual Domain
When you are supporting multiple domains on a single server, each domain being served is often referred to as a virtual domain. Different server software implements or defines virtual domains in different ways. The strict definition of a virtual domain is when a single IP address is shared between multiple domains. Summary uses the term virtual domain in any situation involving more than one domain. Summary gets the name of the domain either from the domain name that the visitor typed as part of the request, the IP address which received the request, the configured server name, or the name of the sub-folder in the Logs folder and calls that the virtual domain name. In some cases these will refer to actual (as opposed to virtual) domains.
Virtual Memory
Memory is hardware that your computer uses to load the operating system and run programs.
Visit
A Web user with a unique IP address entering a Web site at some page for the first time that day (or for the first time in a lesser time period). The number of visits is roughly equivalent to the number of different people that visit a site.
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