# Introduction In this lab, you will learn how to use MongoDB projection to select and exclude specific fields when querying documents. Projection allows you to control which fields are returned in your query results, enabling you to reduce unnecessary data transfer and improve query performance. You will start by selecting include fields, then move on to specifying exclude fields, mixing include and exclude, projecting nested fields, and formatting output fields. By the end of this lab, you will have a solid understanding of how to effectively utilize projection in your MongoDB queries.
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