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A tech stack is a set of technologies used to design, develop, launch and run software, be it a web, desktop, or mobile app. It comprises programming languages, frameworks, databases, platforms, web servers, etc. Javascript is the most popular programming language, database, infrastructure, etc., and Node.js is most popular web framework. The more complex the project is, the more robust and high-level programming languages and databases, or frameworks, you will require. The tech stack also ensures that you meet the quality standards and customer expectations.