How do Lambda functions work in cloud services?

Lambda functions in cloud services (e.g., AWS Lambda) are serverless computing where you upload code, and the cloud provider automatically manages the infrastructure for its execution.

Key points of Lambda operation:

• You write a function that performs a specific task.
• The function is triggered in response to events (HTTP requests, database changes, queue messages, etc.).
• The cloud service automatically scales the number of function instances based on the load.
• Payment is only for the time the function runs.

Example in Java (AWS Lambda handler):

public class Handler implements RequestHandler<String, String> {
    @Override
    public String handleRequest(String input, Context context) {
        return "Hello, " + input;
    }
}

Thus, Lambda allows running code without server management, with automatic scaling and pay-as-you-go pricing.