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It powers the functionality of the front-end, which is the part of the application that users directly interact with.\n\n```plaintext\n├── concepts/\n│   ├── Node.js/\n│   ├── api-design/\n│   │   └── rest-vs-graphql.md\n│   └── authentication/\n│       └── jwt-vs-oauth.md\n├── frameworks/\n│   ├── express/\n│   │   └── express-setup.js\n│   ├── django/\n│   └── laravel/\n├── databases/\n│   ├── sql/\n│   └── mongodb/\n├── Most Asked Interview Questions/\n│   ├── Node.js/\n│   ├── JavaScript/\n├── code-snippets/\n│   ├── middleware/\n│   └── database-queries/\n└── README.md\n```\n\n### Here are the main responsibilities of the back-end:\n1. Data Processing\n- Handles requests sent by the front-end.\n- Processes and validates the data submitted by users (e.g., login details, form submissions).\n\n2. Database Management\n- Stores, retrieves, updates, or deletes data in a database.\n- Examples of databases: MySQL, PostgreSQL, MongoDB, SQLite.\n\n3. 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