What is the minimum balance in Tezos?

Could you please enlighten me on the matter of Tezos? I'm particularly interested in understanding what the minimum balance requirement is for this cryptocurrency. Is there a specific threshold that users must maintain in their Tezos wallets? And if so, what are the implications of falling below this balance? Could you also explain why this minimum balance might be imposed? It would be helpful to gain a deeper understanding of this aspect of Tezos. Thank you for your assistance in clarifying this matter.