Fuel is a critical element in securing Ethereum and processing transactions. Fuel plays a role in many ways:
Fuel helps Ethereum protect against Sybil attacks, which prevent malicious actors from overwhelming the network with fraudulent activity.
Because computation costs fuel, it is not economically worthwhile to accidentally or maliciously spam Ethereum by performing expensive transactions.
Placing a hard limit on the amount of computation that can be performed at any time prevents Ethereum from being overwhelmed, helping to ensure that the network is always accessible.
