**Solution:**

The Big-O notation simply describes how well an algorithm scales or performs in the worst case scenario as the number of elements in a data structure increases. The Big-O notation can also be used to describe other behavior such as memory consumption. Since the collection classes are actually data structures, we usually use the Big-O notation to choose the best implementation to use, based on time, memory and performance. Big-O notation can give a good indication about performance for large amounts of data.

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