What is the difference between .quit and .QUIT in pygame

I just want to know the difference between .quit and .QUIT in pygame. I've tested both but I continue to not understand how they work.

QUIT is the enumerator constant for an event type (see event module). The quit event occurs when the pygame window is closed:

for event in pygame.event.get():
    if event.type == pygame.QUIT:
        # [...]

quit() is a function which uninitialize all pygame modules. This function should be called at the end of the applicaiition:

# initialize all imported pygame modules
pygame.init()

# application loop
while True:
    # [...]

# uninitialize all pygame modules
pygame.quit()

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