Money, in reality, is useless.
It can't comfort me when I'm sick.
It can't talk with me when I need someone to talk to.
It can't congratulate me when I achieve something.
It can't cook me food when I'm hungry nor pour a glass of water when I'm thirsty.

But,
It can be used to buy me medicine when I'm sick.
It can be used to  pay a phone call to my friend or it can be used to pay a visit to my parents' house when I need someone to talk to.
It can be used to buy the things I need or want to host a celebration party with my family and friends when I achieve something.
It can be used to buy food when I'm hungry and buy water when I'm thirsy.

I realize that money is, in fact, useless but becomes useful only when it serves a purpose.