Describe a situation in which a rater might mark a result "irrelevant."

Marking a result as "irrelevant" is appropriate when the content does not address the original query at all. In this situation, the search query represents a specific request for information, and if the content fails to relate to that request, it does not meet the needs of the user. The purpose of a rater is to evaluate the relevance of search results to ensure that users receive accurate and meaningful information in response to their queries.

In contrast, if the content fully addresses the search query, it would be considered relevant and helpful. An outdated page might still provide relevant information, albeit in a less current context, and pages containing advertisements could maintain relevance if they also include pertinent content that relates to the user's query. Therefore, only content that completely ignores the search query merits being marked as irrelevant.