SingleStore, a database system, provides various index types to improve performance and user experience. Indexes are crucial objects that provide path and metadata to the optimizer, and SingleStore supports unique indexes on different table types. Skiplist indexes offer fast insert performance and are optimized for in-memory implementation, while clustered columnstore indexes provide significant data compression and can only be combined with in-memory row store indexes on the same table. Hash indexes are used when equality filters are employed in queries, and full-text indexes enable searching for words or phrases in text columns. Additionally, SingleStore supports storage of JSON data and quickly querying it using indexing on persisted columns.