SQL databases like PostgreSQL offer rigid, table-based schemas and follow ACID principles, making them ideal for structured data and applications requiring consistent transactions. NoSQL databases like MongoDB and ElasticSearch provide flexible schemas, are horizontally scalable, and are suited for unstructured data, web apps, IoT, and real-time text searching. PostgreSQL is trusted in corporate sectors for reliability, MongoDB is favored by startups for scalability, and ElasticSearch is essential for real-time observability and log analysis.
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