In Data Structures and Algorithms (DSA) a Heap is a complete binary tree that maintains a specific order between parent and child nodes known as the Heap Property. In a Min-Heap the parent node is always smaller than its children with the smallest element at the root. In a Max-Heap the parent is larger than its children with the largest element at the root. Heaps are commonly used to implement priority queues and support operations like insert delete and peek efficiently with a time complexity of O(log n) for insertions and deletions.