Binary Search Program, Algorithm & their Time Complexity. In this tutorial, You’ll learn about binary search algorithm, how it’s useful in searching and the time complexity of a binary search.

## Binary Search

A Binary Search is used to **search an element in a sorted array**. Binary search is also known as half-interval search or logarithmic search. It works by comparing a value (value needs to search) to the middle element an array. If a value matches with the middle element then the position is returned otherwise the algorithm repeats if the value is less than or greater than the middle element.

A Binary search algorithm is efficient than the linear search algorithm. The time complexity of binary search is O(log(n)). →