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Final answer:MongoDBand SimpleDB are examples ofNoSQL databases. They are flexible and scalable, allowing for the storage and retrieval of unstructured or semi-structured data. These databases are commonly used for big data applications.Explanation:MongoDBandSimpleDBare both examples ofNoSQL databases. Unlike traditional SQL databases, NoSQL databases like MongoDB and SimpleDB do not use a structured query language for data manipulation. Instead, they use a flexible and scalable data model that allows for the storage and retrieval of unstructured or semi-structured data. These databases are commonly used for big data applications and are well-suited for handling large volumes of data in a distributed and cloud-based environment.Learn more aboutNoSQL databaseshere:brainly.com/question/33366850#SPJ11...