A Dynamic Array is a data structure that can grow or shrink in size as needed, unlike a static array that has a fixed size. This flexibility allows for efficient memory usage, as it can allocate more space when elements are added and release space when elements are removed. Dynamic arrays are commonly used in programming languages like Python and Java. When a dynamic array reaches its capacity, it typically creates a new, larger array and copies the existing elements to this new space. This process, known as resizing, ensures that the array can accommodate additional elements without losing data. Dynamic arrays are often implemented using underlying data structures like linked lists or arrays.