go语言的ticker定时器与time sleep有啥区别

以下两份代码，及执行结果

package main

import (
	"fmt"
	"time"
)

func main()  {
	t:=time.NewTicker(2*time.Second)

	for {
		v,ok:= <-t.C
		if ok{
			fmt.Println(v)
			//执行某任务
		}
	}
}

运行结果

2021-10-20 05:08:13.043167 +0800 CST m=+2.003717208
2021-10-20 05:08:15.043263 +0800 CST m=+4.003782483
2021-10-20 05:08:17.04303 +0800 CST m=+6.003520033
2021-10-20 05:08:19.042878 +0800 CST m=+8.003336958
...

package main

import (
	"fmt"
	"time"
)

func main()  {

	for {
		time.Sleep(2*time.Second)
		fmt.Println(time.Now())
	}
}

运行结果

2021-10-20 05:11:10.520733 +0800 CST m=+2.004706789
2021-10-20 05:11:12.521883 +0800 CST m=+4.005826687
2021-10-20 05:11:14.522189 +0800 CST m=+6.006102467
2021-10-20 05:11:16.524366 +0800 CST m=+8.008249485