Goroutines vs Threads, Explained With Boda Bodas

Imagine Kampala's traffic. An OS thread is a bus: it carries a lot, but it takes up a lane, costs a fortune to run and you can only have so many. A goroutine is a boda boda — tiny, cheap to start, and the Go scheduler weaves thousands of them through a handful of lanes (OS threads).

func deliver(orders []Order) {
	var wg sync.WaitGroup
	for _, o := range orders {
		wg.Add(1)
		go func(o Order) {
			defer wg.Done()
			ride(o) // each delivery gets its own boda
		}(o)
	}
	wg.Wait()
}

The scheduler (the stage chairman, if you like) decides which boda moves next. You just describe the work.