what does x reprsent in this code ?

[astral_travel]

what if i have this code:

x = int(input('enter a number: '))

if x == 7:

    print('x equals 7')

else:

    print('input does not equal 7')

very simple right, but what if the user presses 'enter' or 7.7 or 'abc'...
then i get an error, so how do i replace it with some response ?