A Trie is a specialized tree-like data structure used to store a dynamic set of strings, often for tasks like autocomplete and spell checking. Each node in a Trie represents a single character of a string, and paths from the root to the leaves represent complete words. This structure allows for efficient retrieval of words, as common prefixes are shared among them, reducing the overall space needed. Tries are particularly useful in applications involving dictionaries or search engines, where quick lookups are essential. They can also be used in conjunction with algorithms for tasks like prefix matching and string searching, making them a valuable tool in computer science.