What is the use of join() in Python threading?

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I was studying the python threading and came across join().

The author told that if thread is in daemon mode then i need to use join() so that thread can finish itself before main thread terminates.

but I have also seen him using t.join() even though t was not daemon

example code is this

import threading
import time
import logging

logging.basicConfig(level=logging.DEBUG,
                    format="(%(threadName)-10s) %(message)s",
                    )

def daemon():
    logging.debug('Starting')
    time.sleep(2)
    logging.debug('Exiting')

d = threading.Thread(name="daemon", target=daemon)
d.setDaemon(True)

def non_daemon():
    logging.debug('Starting')
    logging.debug('Exiting')

t = threading.Thread(name="non-daemon", target=non_daemon)

d.start()
t.start()

d.join()
t.join()

i don’t know what is use of t.join() as it is not daemon and i can see no change even if i remove it

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