Serverless
Serverless is a cloud hosting model where code runs on demand, in response to a specific event, without the engineering team having to provision or manage a server continuously. Billing follows actual usage, down to each execution, rather than a fixed cost for a server running non-stop.
A typical use case is processing a file a user uploads: resizing an image, generating a PDF, or sending a notification after a signup. These tasks are occasional and unpredictable in timing, which makes it wasteful to keep a dedicated server running 24/7 just to handle a few seconds of work per day. Serverless also absorbs sudden traffic spikes with no prior configuration, since the cloud platform scales resources automatically.
Serverless quickly becomes more expensive than a dedicated server once traffic is constant and high, and many teams only discover this after the fact when reviewing their cloud bill. There's also cold start to account for (a slight delay on the first call after a period of inactivity) and execution time limits, which make this model a poor fit for long-running tasks or applications that need very stable latency.
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