What is a container class, Computer Engineering

What are the types of container classes in C++? 

Ans) A container class is a class that is used to hold objects in memory/external storage. A container class behaves as a generic holder. A container class has a predefined behavior and a well-known interface. A container class is a supporting class whose purpose is to hide the topology used for maintaining the list of objects in memory. When a container class having a group of mixed objects, the container is known a heterogeneous container; when the container is holding a group of objects that are all the similar, the container is known as homogeneous container. 

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