Which types of relationships often utilize embedding?

The correct choice highlights that embedding is particularly effective in one-to-one and one-to-many relationships. In a one-to-one relationship, a single document in a collection can include another single document as an embedded document, which keeps related data together and simplifies access. This can be advantageous for entities that have a direct correlation and are often accessed together, such as a user profile and its corresponding settings.

For one-to-many relationships, embedding is equally beneficial when the main document has multiple related entries. This keeps the data locality intact, allowing for efficient access and reducing the need for multiple queries to retrieve related documents. An example could be a blog post (the parent document) that embeds its comments (the child documents), allowing for quick retrieval of all comments while viewing the post, without requiring separate lookups.

Using embedding in these scenarios helps preserve the logical connections between data points, enhances performance, and simplifies data management by reducing the complexity of database interactions. This is not the case for many-to-many relationships, which typically require referencing due to their complexity and the potential for large data sets.