Which type of words are ignored during keyword searches as stop words?

Stop words are commonly defined as the words that are filtered out and ignored during searches because they tend to occur so frequently that they do not bring significant value to the results. In this context, stop words typically include common function words such as prepositions (e.g., "in," "on," "at"), conjunctions (e.g., "and," "but," "or"), and articles (e.g., "the," "a," "an").

Punctuation marks and conjunctions, by themselves, do not usually contribute to the intent or meaning of a search query, making them ideal candidates for exclusion in order to streamline the search process. This process helps improve the efficiency of search algorithms, allowing them to focus on more meaningful content.

The other categories mentioned, like adjectives, adverbs, verbs, and nouns, can often carry significant weight in determining the intent or context of a query, and are therefore typically not classified as stop words. Hence, the correct answer focuses on the true nature of stop words as being primarily composed of common function words that do not provide substantial information for search relevance.