MongoDB is a popular NoSQL database known for its flexibility, scalability, and ease of use. However, like any technology, it has its own set of limitations and disadvantages that you should be aware of: 1. Limited transactional support: MongoDB does not support transactions as traditional relational databases. This can make it more difficult to ensure data integrity and consistency in certain situations. 2. Limited indexing options: MongoDB supports limited indexing options compared to SQL databases. This can make it more difficult to perform certain types of queries and can impact performance in some cases. 3. Lack of support for complex relationships: MongoDB does not support complex relationships between data like SQL databases. This can make it more difficult to model and query data that has complex relationships. 4. Limited ad hoc querying capabilities: MongoDB is not as good at ad hoc querying (performing queries on the fly) as SQL databases are. This can make it more difficult to perform certain types of queries and can impact performance in some cases. 5. Steep learning curve: While MongoDB is generally considered easy to learn and use, it can have a steep learning curve for developers new to database management and NoSQL databases.