Partial Object Updates` will be a significant feature in MongoDB's NoSQL database, allowing for efficient and cost-effective updates to large objects without requiring full row updates. This feature is particularly important in NoSQL solutions where stored object sizes are larger than traditional database rows, making full updates more expensive due to increased data transfer costs. By using special `$ operators` such as `$inc`, `$set`, and `$push`, MongoDB enables partial updates, providing atomicity and reducing replication costs by only replicating the updated portion of the object.