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.
Questions having to do with Craft's ElementCriteriaModel, which is used to return a set of elements narrowed by a variety of parameters.
Entries hold the content that you want to display on your web pages. Each entry has an Author, a Post Date, an Expiration Date (if desired), a status (enabled or disabled), and, of course, content.
Information about an error displayed when an unexpected condition (error) occurs.