Keywords can be added to your entries in a specific field. In the entry editor, the keywords field is displayed in the General tab. There, you can add new keywords to an entry by typing it in. If auto-completion is activated for the field keywords (Options → Preferences → Entry editor), suggestions are given based on existing keywords.
By default, the keyword separator is a comma. It can be redefined in the preferences (Options → Preferences → Groups).
Additionally, the special field values (relevance, priority, etc.) can be added to the keywords field automatically. This will allow you to group, sort, and search your library based on the special field values. See in Options → Preferences → Entry table the item "Special fields" and select "Synchronize with keywords".
Select at least one entry and go to Edit → Manage keywords.
The keyword list is displayed in two modes:
the keywords shared by ALL of the selected entries.
the keywords appearing in ANY of the selected entries.
You can edit a keyword by double-clicking on it, or by clicking on the pencil icon. A keyword can be deleted by clicking on the minus icon.
To fasten the addition of often-used keywords, JabRef can store the list of your preferred keywords.
Go to Options → Manage content selectors.
First, click on the field name "Keywords". Then, enter the list of your preferred keywords. Now, when you start to type one of your preferred keywords, JabRef will display a list of the matching ones (independently of the auto-completion). For more details, see the help section about Managing content selectors.
You can search for entries having specific keywords. For this, use a regular expression search, such as
anykeyword matches apple or
keywords = modell?ing. For more details, see the help section about Searching within the library.
Different types of groups can be created based on the values of the field keywords. See the help section about Groups.