A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.
Tags are keywords or labels that categorize and group your question with other, similar questions.
for questions about tag synonyms (how they work, who can create them, etc).
Use to propose adding or changing tag-specific help messages shown when asking a question that explain how to ask a good question in the specific tag.
One of the 7 Essential Meta Questions of Every Beta
seeing the source code like html, markdown to see how a post/page was constructed.