What does it mean int n = sizeof(a)/sizeof(int)?

what does it mean int n = sizeof(a)/sizeof(int)?

@rohit_sharma
Suppose there is a long brick line image
You know the length of the line lets say 24cm.
You know the length of each brick lets say 2cm.
So to find the number of bricks in the wall, you will calculate it by 24/2 = 12 bricks