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Gas fees in the world of cryptocurrencies, particularly on networks like Ethereum, are the costs associated with processing transactions. They exist due to the computational power required to validate and add transactions to the blockchain. Miners, who perform this work, are incentivized with these fees, ensuring the network remains secure and functional. High network usage can lead to increased gas fees, reflecting the demand for faster transaction processing. Understanding gas fees helps users manage their transactions effectively and supports the overall health of the blockchain ecosystem.