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Search Engines

Search engines are an essential part of any web application, responsible for providing efficient and relevant search results for users. They store and retrieve data based on unique indexes, which allow for fast and accurate searches. As a backend developer, understanding search engines functionalities, and how to integrate them into your web application, is crucial.

Types of Search Engines

There are two primary types of search engines:

  1. Full-text search engines: These are specifically designed for searching and analyzing text documents. They can efficiently index large volumes of text and provide relevant results based on keywords or phrases. Popular full-text search engines examples include Elasticsearch, Solr, and Amazon CloudSearch.

  2. Database search engines: Database engines are built-in features of most databases. They provide search capabilities within the data stored in the database. Examples include MySQL FULLTEXT search and PostgreSQL Full-Text Search.

Key Concepts

When dealing with search engines, it’s important to understand these key concepts:

  • Indexing: The process of analyzing and storing data in an optimized format for fast search and retrieval.
  • Tokenization: Breaking text into individual words or terms (also known as tokens), for efficient indexing and searching.
  • Querying: The act of searching the indexed data by asking a specific question or requesting information based on keywords or phrases.
  • Relevance scoring: A score assigned to each search result that indicates how closely it matches the query, based on algorithms and relevance models.


To integrate a search engine into your web application, you would typically follow these steps:

  1. Choose the search engine: Identify the search engine that best suits your application’s needs, considering factors such as scalability, performance, and ease of integration.
  2. Index your data: Analyze and store your data using the chosen search engine. This process may involve creating an index, specifying fields, and defining how the data should be tokenized and analyzed.
  3. Implement search functionality: Develop the backend code for handling search requests, such as sending queries to the search engine and parsing the responses. Additionally, make sure to handle user inputs, like keywords, phrases, and filters.
  4. Display search results: Design the frontend of your application to show search results in a user-friendly manner, including pagination, sorting, and filters.

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