What is dynamic querying in MongoDB?

Dynamic querying in MongoDB refers to the capability to create and execute queries that are constructed based on user inputs during the runtime of an application. This means that rather than having fixed, predetermined queries, dynamic querying allows developers to adaptively build queries that cater to varying user requirements. For instance, a web application might allow users to filter data by multiple criteria such as date ranges, categories, or other attributes, and these filters can change with each user's interaction.

This flexibility is particularly integral in modern applications where user preferences and data access patterns can greatly differ. By generating queries based on specific user inputs, developers are able to ensure that their applications remain responsive and relevant to users' needs, providing a more personalized experience with the underlying data.

The other choices do not accurately capture the essence of dynamic querying. For example, running queries without parameters or those requiring predefined static parameters do not involve any adaptability or customization based on user input. Similarly, generating queries automatically is not the same as generating queries based on specific user interactions, which is the core of dynamic querying.