TAG:In online computer systems terminology, a tag is a non-rating keyword or term assigned to a piece of information such as an Internet bookmark, digital image, or computer file. This kind of metadata helps to describe an item and allows it to be found again by browsing or searching. Tags are generally chosen informally and personally by the item's creator or by its viewer, depending on the system.
BLOG:
A Web site on which an individual or group of users write their opinions, information, etc. on a regular basis.
Blog is a type of website ,supposed to be updated with new content from time to time. Blogs are usually maintained by an individual. It includes commentary and description of events and images and videos.PODCAST:
A podcast is a series of digital media files that are release episodically and often download through web syndication. The mode of delivery differentiates podcasting from other means of accessing media file over internet such as direct download link. The host or author of a podcast is called podcaster. We can also subscribe to podcast by using software like "i podder" and "i tunes". We can podcast national and international news, jokes,music,interviews etc.
WIKIS:
Its is a website, which is collaboratively developed by a group of users, which allows any user to add and edit content. Its a website whose users can add, edit or delete its content .
Wikis are typically powered by wiki software. It includes knowledge management, notetaking etc. Wiki famous sites are wikianswers, wikitionary, wikipedia, wikiquote etc. in which wikipedia is most popular.
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