Heapsort is an efficient, in-place sorting algorithm that is often implemented in computer science. It is a comparison-based sorting algorithm that divides an array into two parts: the lower part, which is an ordered heap structure, and the upper part, which is an array sorting the values into the heap structure. Heapsort is considered an efficient algorithm, as it has a worst case time complexity of O(n log n), making it comparably faster than many other sorting algorithms.

Heapsort works by building a max-heap from the data, and then iteratively removing the maximum element and placing it at the end of the array. This creates a sorted array from the max-heap in a linear time operation known as heapify. By continually removing the maximum element, rebalancing the heap, and placing the element in the array, heapsort is able to sort an array in O(n log n) time.

Heapsort can be efficiently implemented in both max-heap and min-heap variations. The min-heap variation of heapsort is always preferred as it has a slightly better worst-case runtime.

Heapsort is popular in programming competitions due to its efficiency and relatively straightforward implementation. Due to its high performance, heapsort is often used in operating systems and web servers to sort data quickly.

Overall, heapsort is a fast and efficient comparison-based in-place sorting algorithm. Its modest complexity and high efficiency make it a popular choice for sorting data in computers and web applications.

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