And what are workers?

In the context of Golang, workers are goroutines or separate execution threads that handle tasks in parallel. Typically, workers are used in the "worker pool" pattern — a pool of workers where several goroutines take tasks from a shared queue and execute them, which allows for efficient resource utilization and control of parallelism.

Example of a simple worker in Go:

func worker(id int, jobs <-chan int, results chan<- int) {
    for j := range jobs {
        fmt.Printf("Worker %d processing job %d\n", id, j)
        results <- j * 2 // example processing
    }
}

func main() {
    jobs := make(chan int, 5)
    results := make(chan int, 5)

    for w := 1; w <= 3; w++ {
        go worker(w, jobs, results)
    }

    for j := 1; j <= 5; j++ {
        jobs <- j
    }
    close(jobs)

    for a := 1; a <= 5; a++ {
        <-results
    }
}

Thus, workers enable parallel processing of tasks, improve performance, and help manage load.