Labels are used within a community to help categorize articles in a variety of discussion styles; forums, blogs, Q&A, ideas, TKBs. Labels enable you to categorize the content you write based on the themes or content in the article. For example, in a support Q&A for troubleshooting connectivity issues with your smart phone, you might apply labels like "iPhone", "Galaxy", "AT&T", or "Verizon".
Unlike tags, labels are created by the Community Admin and typically controlled for consistency and need. Authors must choose/apply labels from a pre-defined list for the node in which the article appears. Tags are more freeform and can be created by authors.
While clicking on each label in the list available on the right side of the page, you can not only view a list of threads related to this label but explore definition of each label itself. It's provided in the right frame with the graphical symbol of label's subject.
To post your comment:
Tip: Search the idea exchange first to make sure that someone else hasn't already posted the same idea.
You can use simple HTML, format the text, or add links or images.