What is a linear search?

A linear search is a straightforward algorithm used for finding a specific value within a list by checking each element one at a time in sequential order. Starting from the first element, the search proceeds through the list until the target value is found or the end of the list is reached. This method is also known as a sequential search because of its step-by-step approach.

Its simplicity makes it easy to understand and implement, particularly for small or unsorted datasets. However, it is not the most efficient searching algorithm for large lists, as its time complexity is O(n), meaning that in the worst case, every item must be checked.

In contrast, other options do not accurately describe a linear search. A recursive technique generally implies a method that calls itself to divide the problem into smaller subproblems, which does not align with the definition of a linear search. A sorting algorithm refers to methods designed to arrange data in a specific order, rather than searching for a specific value in an existing structure. Lastly, a graphical representation of data relationships does not pertain to searching methods but rather to how data can be visually displayed or organized.