If BaCl2 is aqueous, how can it sometimes be a solid hydrate?

I'm just wondering... Or am I missing something?
Explanations would be helpful, thank you.

BaCl2 is basically a solid substance, but its structure is in a way that can keep H2O molecules in it. it can keep 2 molecules of H2O in itself, so existence of water in its structure may lead in having some kinda humidity in the solid substance, but its not that much to solve BaCl2 , in fact BaCl2 is keeping water in it, and not water keeping BaCl2.

BaCl2 in its normal state is a white, solid substance. If you use the solid BaCl2 in a chemical reaction , you write it as BaCl2(s)
If you dissolve the BaCl2 in water before the reaction, or if BaCl2 is a product of a reaction in an aqueous solution , then in the equation you write BaCl2(aq) to show the physical state that it is in , in that particular reaction.