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Insertion Sort is an efficient algorithm for sorting a small number of elements. It is similar to sort a hand of playing cards. Playing a card is one of the techniques of sorting and in Insertion Sort we follow following steps. - Start with an empty left hand and cards face down on the table. - Then remove one card at a time from the table and Insert it into the correct position in the left hand. - To find a correct position for a card, we compare it with each of the cards already in the hand from right to left. Input : A sequence of n numbers a1, a2, ..., an. Output : A permutation (reordering) of the input sequence such that a1<=a2<=a3<=….an The numbers that we wish to sort are also known as Keys. Although conceptually we are sorting a sequence, then input comes to us in the form of an array with n elements. Pseudocode of Insertion Sort INSERTION-SORT(A) 1. for j = 2 to n 2. key ← A [j] 3. // Insert A[j] into the sorted sequence A[1..j-1] 4. j←i–1 5. while i > 0 and A[i] > key 6. A[i+1] ← A[i] 7. i←i–1 8. A[j+1] ← key