Keywords are specific words that a user will commonly use when searching knowledge. You can specify keywords for an article so that it is more likely to appear in a search result.
There are two ways that you can associate keywords with an article:
using a keyword attribute on the Article window (this is the recommended method) (this is configured by adding a Keywords/Tags attribute to the Article object and window, and setting this to be included in knowledge searches)
using an action to add a collection of keyword objects to the article (this method is harder to use and maintain) (this is configured by adding the Add Keyword optional action to the required status using Process Designer)