When you send crypto, you usually pay a small transaction fee, sometimes called a network fee. This fee does not go to a company but to the participants who keep the network running, such as miners or validators, as a reward for including your transaction and securing the blockchain.
Fees are not fixed. They tend to rise when the network is busy and many people are competing to have their transactions processed, and fall when things are quiet. On some networks you can choose a higher fee for faster confirmation or a lower fee if you are willing to wait. On Ethereum these costs are known as gas fees.
Understanding fees helps avoid surprises. Small networks or quiet periods may cost very little, while congested moments can make fees noticeably higher. Many wallets estimate the fee for you and let you adjust it, so you can balance speed against cost.
