Behind every fast query, smart filter, or scalable database lies a powerful data structure. These 20 structures aren’t just theory, they’re the backbone of real-world systems that power search engines, time-series storage, blockchain, and more. 1. Indexing Structures Hash Index, B-Tree, Skiplist, Bitmap Index, Trie These are the go-to structures for fast data access. Whether it’s quick key-value lookups in memory or sorted traversals on disk, these structures form the core of query...
