# Introduction In this lab, you will learn the fundamentals of using MongoDB indexes to optimize query performance and sorting operations. The lab covers several key steps, including querying with indexes, sorting using indexes, checking index coverage, handling missing indexes, and removing unused indexes. By the end of the lab, you will have a solid understanding of how to leverage MongoDB's indexing capabilities to improve the efficiency of your database applications. The lab starts by creating a sample collection and demonstrating how to create an index on a specific field to speed up queries. It then explores using indexes for sorting operations and checking the index coverage for a given query. The lab also covers scenarios where an index is missing and how to handle such cases, as well as the process of removing unused indexes to maintain a healthy database.
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