Algolia provides a hosted search engine as a service that allows for full-text search across multiple attributes with features like typo-tolerance, faceting, numerical search, and geo search. It has a JavaScript API client and can perform searches in under 10 ms to enable Google Instant-search like experiences, and integrates with Rails applications through ActiveRecord and MongoID compliance as well as automatic indexing through callbacks and separate indexes for development, test, and production environments.