Final answer:
When two conditions are joined by the AND logical operator, both conditions must be evaluated as TRUE to be included in the query results. The AND operator is used to narrow search results and link necessary information.
Step-by-step explanation:
When two conditions are joined by the AND logical operator, both of the conditions must evaluate as TRUE in order to be included in the query results. The AND operator is used to narrow search results and tell the database to include all the search terms in finding sources. Using AND helps you search by linking necessary information and focusing information. For example, if you have the search terms 'artificial intelligence' (title), 'Buiten' (author), and '2019' (year), using the AND operator between them can yield the exact journal source you need.