Doubt in int array

On initialization, when we write int a[ ] [100] this is the address where the numbers store or 100 specifies the max numbers that we can store???

@pragyatyagi482_7d271a80b60a17c1,
numbers per row,100 is the column no.

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and what if i write only int a[100]
What does it represent???

@pragyatyagi482_7d271a80b60a17c1,
its 1d array only one row
thats 2d array