The Laravel Query Builder is a fluent interface for creating and executing database queries. It is usually started with DB::table('table_name') and supports selects, joins, filters, aggregation, inserts, updates, deletes, chunking, and locking across Laravel’s supported databases.

It uses PDO parameter binding for values supplied through its normal methods, which improves safety and portability. Query Builder is useful when a full Eloquent model is unnecessary, when working with reporting queries, or when performing efficient bulk database operations.