Tags are a way to organize your data in the ways that are more customized to your company. Tags help you find records that are otherwise not easily searchable. Tags are an easy way of labeling a record using a word, or short phrase. Multiple tags can be associated with a record. They are the most powerful tools which will differentiate the important records from the other records.
How to Add Tags
In record summary view click on the “Add Tag” button to create a new tag.
Add a Tag Name.
Check box “Public Tags“. Public tags (Shared Tags) are shared with all users.