If an interviewer asks ten software developers to describe how to implement a sort algorithm, you'll probably get 10 slightly different but related answers. Every software developer has a method and a work style of their own that works for them and makes them efficient at their job. On Salesforce's "Interview Tips" page, they encourage candidates to talk about themselves and share their unique experiences and insights. An interviewer in this case wants to hear about the specific method you use and if you take any shortcuts to arrive at the final product. They want to know if you take shortcuts which could compromise the quality of work you are doing. They would like to hear about your development methodology and how you implement an insertion sort algorithm while doing your due diligence and quality checks along the way. In simple terms, the way an insertion sort works is it starts from the index 1(not 0), and each index starting from index 1 is like a new card, that you have to place at the right position in a sorted sub-array on the left side.