In cryptocurrency networks like Bitcoin, every transaction needs to be verified and packaged. This process is completed by "miners". To incentivize miners to contribute their electricity and computational resources to process transactions, users need to pay a "miner fee", also known as a "transaction fee", when sending a transaction.

This fee is not fixed; it changes based on the network's congestion at the time. When many people are making transfers on the network simultaneously, miners will prioritize transactions that are willing to pay higher fees. This is somewhat like ordering food online during peak hours; if you're willing to pay a higher delivery fee, you might get your meal faster.

Therefore, when the blockchain network is busy and transaction volume is high, miner fees will rise significantly, which can lead to even a small transfer requiring a disproportionately high fee. Conversely, during periods with fewer transactions, miner fees will be much cheaper.

For beginners, understanding the role of miner fees is helpful for correctly grasping the operational logic of the blockchain. When using cryptocurrencies, choosing a compliant platform that displays real-time fees and supports custom transaction fees can help you manage your transaction costs more effectively.