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In Go, context is used to pass cancellation signals, timeouts, and other values between goroutines, especially when working with requests, timeouts, and operation cancellations.

Practical application:

• Cancel long-running operations when closing an HTTP request.
• Transmit a timeout so that an operation does not run longer than the specified time.
• Pass metadata (e.g., request identifiers) through the call chain.

Example of usage:

func handler(ctx context.Context) {
    select {
    case <-time.After(5 * time.Second):
        fmt.Println("Operation completed")
    case <-ctx.Done():
        fmt.Println("Operation cancelled")
    }
}

func main() {
    ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
    defer cancel()
    handler(ctx)
}

Here, the operation will be interrupted after 2 seconds, even if it is scheduled for 5.