Is Box free to use?

Excuse me, could you clarify for me if Box is indeed a free service to utilize? I've heard varying opinions on this, and I'm hoping to get a definitive answer. Is there a basic version that doesn't require any payment, or do all features come with a cost? If there are charges involved, could you elaborate on the pricing structure and perhaps mention any potential discounts or promotions available? I'd appreciate any clarity you can provide on this matter.