Legal wrapper
With stocks, you become an owner
With cash or a bond, you mostly hold money or a claim. With a stock, you own a share of a productive tool. You leave the world of simple contracts and enter the world of ownership.
That matters everywhere: in the United States, Japan or Turkey, a good company can sell, export, invest, raise prices and survive difficult cycles.
The trade-off is clear: the market can temporarily value those companies much lower. You own something real, but you are never protected from volatility.