# Understanding Insertion Sort So Good That You Could Teach It to Others

Insertion sort is a simple sorting-algorithm that builds the final sorted array (or list) one item at a time. In this tutorial, we will learn to understand why Insertion Sort so good that you could teach it to others.

Insertion sort is a simple sorting-algorithm that builds the final sorted array (or list) one item at a time. It is much less efficient on large lists than more advanced algorithms such as quick-sortheap-sort, or merge-sort.

However, insertion sort provides several advantages:

• Simple implementation.
• Efficient for (quite) small data sets, much like other quadratic sorting algorithms.
• More efficient in practice than most other simple quadratic O(n2) algorithms such as selection-sort or bubble-sort.
• Adaptive, efficient for data sets that are already substantially sorted: the time-complexity is O(kn) when each element in the input is no more than k places away from its sorted position
• Stable; does not change the relative order of elements with equal keys.
• In-place; only requires a constant amount O(1) of additional memory space.
• Online; can sort a list as it receives it.

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