Go: What is the difference between goroutine and thread in Go?

Goroutine — lightweight, managed by Go. Thread — OS-managed, heavier.

Goroutine:

• Starts with 2KB stack.
• Managed by Go scheduler.
• Multiplexed onto OS threads.
• Millions can run concurrently.
• Cheap to create.

1go func() {
2    // Runs in goroutine
3}()

Thread:

• Starts with 1-8MB stack.
• Managed by OS.
• Limited (thousands).
• Expensive to create.

Key differences:

• Goroutine — 2KB vs Thread — 1-8MB.
• Goroutine — Go scheduler vs OS scheduler.
• Goroutine — cheap vs Thread — expensive.