Sitecore query
Version: 10.2
Sitecore query provides query string syntax that filters and retrieves items from the Sitecore content tree using a simplified version of XPath syntax. Developers use Sitecore query strings in .NET code and in the Source field of field definition items (it requires the “query:” prefix at the start of the Source field).
Note
Sitecore query is not scalable if you are using item buckets to store a large number of items in the content tree.