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Serverless doesn't mean there are no servers , it means you don’t manage the servers.
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Serverless Function is a small backend function that runs in the cloud only when triggered, and automatically scales.
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For example, in traditional way, you need to create a server with express js. host it somewhere like heroku etc and need keep running 24/7 hours. But with Serverless Functions, you only write the function, and the cloud provider runs it only when needed.
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Certificate Management means handling SSL/TLS certificates that make websites secure (https://)
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Certificate? A certificate (SSL/TLS) is what makes a website secure (https://) and shows in the browser.
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Without it website is "Not secure". And with it website is Safe and encrypted
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SSL (Secure Sockets Layer) and TLS (Transport Layer Security) are security protocols. They make the connection between your website and your user secure and encrypted.