• The Array class is not part of the System.Collections namespace. But an array is a collection, as it is based on the list interface.
• Array has a fixed capacity but the classes in the System.Collections namespace don’t have fixed capacity. That’s why array is a static container, but collection is dynamic container.
• Collections objects have a key associated with them. You can directly access an item in the collection by the key. But to find a specific item in an array, unless you don’t know the index number you need to traverse the array to find the value.
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