Tagging

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Tagging is a term used in a number of contexts for different purposes, mostly referring to adding a tag of some form.
The most common meaning of tagging is to attach metainformation to some data or stuff (sometimes called a "blob"). This metadata in the tag is used to describe, categorize, discrimate the stuff. Therefore a tag enables handling of data that is otherwise not understandable by a machine or human. Therefore tagging could be described as "making things (machine) readable and (machine) handable by adding a suitable description". This is similar to somehow mark something and therefore add it to a certain kind of category, belonging, owner, etc.

  • In many computing and information processing contexts, tagging is the process of labelling a piece of data with metadata.
    • Content on webpages is displayed as HTML which uses the construct of HTML tags
    • In the practice of collaborative categorization using freely chosen keywords known as folksonomy, Tags are descriptors that individuals assign to objects.
      • Many web services have now incorporated this kind of collaborative categorization on the web, as either the main feature, like BlinkList, Connectedy[1], del.icio.us, or furl, or a way to navigate content within the service, like flickr and FOTKI.com. Blog posts can be tagged using the rel-tag standard which are then found and indexed by search engines like Technorati.
    • For instance, in linguistics, a corpus may undergo part-of-speech tagging.
    • It is also often used in relation to audio data compression, in which case it refers to adding ID3 tags or an equivalent to label a piece of music.
    • In CVS, to tag a project is to associate a name with the current version of every file in project directory. This is done so that one can easily revert to a state where all files are known to compile together.
    • On Bulletin board systems, a single-line pithy quote would be attached to the end of a message, and was sometimes referred to as a tag or a tagline. This would later be expanded to the 4-line standard for email and usenet news message signatures.
  • The simplest form of graffiti is a simple signature known as a tag, and is consequently referred to as tagging.
  • In sport it refers to passing control to another member of your team - for instance in professional wrestling.
  • The labelling of an object or person with RFID (or similar technology) is also known as tagging.
  • Tagging is also used in biochemistry where tags can serve multiple purposes. They can aid purification or detection. Tags can also be the basis for non-covalent construction of new nanostructures
  • In particle physics, tagging is the technique of detecting a particle coming out of a process in order to obtain information (from kinematics) about a particle which is not detected.
  • In barbershop music, a tag refers to the last measures of a song. It is usually the part of the song that creates the greatest number of overtones: each of the four singers reenforces each other creating an expanded sound that characterizes barbershop music.
  • In the video game series Halo, it is said that you "tag" an opponent when you successfully throw a plasma grenade at him. The plasma grenade will stick to your opponent and glow a bright blue for three seconds, before blowing up and killing him.
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