If you want to insert multiple documents into a collection, which method would you use?

The method to use for inserting multiple documents into a collection in MongoDB is .insertMany(). This method is specifically designed for this purpose, allowing you to pass an array of documents that you want to add to the collection in a single operation. This not only simplifies the code but also improves performance by minimizing the number of round trips to the database.

When using .insertMany(), you can also take advantage of options such as ordered and bypassDocumentValidation, which further enhances its functionality depending on your specific needs. This makes it the most suitable and efficient choice for bulk inserts in MongoDB.

The other methods listed are either not relevant or do not offer the same capability. While .insert() is used for inserting a single document or an array of documents (though it is less common for multiple inserts than .insertMany()), it does not explicitly indicate bulk insertion as .insertMany() does. The methods .pushMany() and .saveAll() do not exist in the MongoDB API, making them invalid choices for this scenario.