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.
used to classify questions into different groups. The "tags" tag should be applied to any meta question asking about tags.
The scope of the main site: what questions are on-topic and what is off-topic
Questions about how to promote the site and gain more visitors, questions, answers and users.
should be applied to Meta questions asking about Questions on the main site, or on the meta site.
Questions related to the name of the main site (currently it is named "Cognitive Sciences")
Questions related to migration, i.e. migrating off-topic questions from Cognitive Sciences Stack Exchange to another Stack Exchange site, or from elsewhere to this site.
7 Essential Meta Questions of Every Beta. This tag covers any of those questions.