Tags are similar to categories, but are largely free-form. They’re created ad hoc – sometimes by editors, sometimes by users.
Tags have the same functional mechanism of categories (a structure to which items are assigned), with some subtle differences.
- Tags are normally “flat,” without hierarchy.
- Tags can often be created on-the-fly by editors while they organize content.
- The editorial interface is often just a simple textbox, sometimes with type-ahead detection.
- Tags are sometimes used with user generated content to allow visitors to organize content.