Does Core cost money?

Could you please clarify something for me? The paragraph you mentioned mentioned "Does Core cost money?" I'm a bit confused about it. Could you tell me if there's a fee associated with Core? Is it necessary to make a financial investment to access or use Core? Also, if it does have a cost, could you elaborate on what the pricing model is like? Is it a one-time payment, a subscription fee, or something else? I'd really appreciate your help in understanding this matter. Thank you in advance for clearing up my confusion!