Today, search is an important functionality in enterprise applications and end-users are obsessed with the experience of Google Search and expecting the application search also provides similar experiences.
This requires us to design and implement a search engine along with your golden source (RDBMS/NOSQL). There are many search engines available in the market today like Elasticsearch, Apache Solr, Azure Cognitive Search, etc. These provide a better search experience and features like typeahead, fuzzy search, boosting the search results based on relevancy, similarity search, etc.