# What is UserOperation?
The ERC-4337 process begins with a UserOperation, which is similar to a transaction but represents the user's intention to transact. A UserOperation can encompass multiple requests and additional data, enabling a Smart Contract Account (SCA) to execute the intended transactions.
While UserOperations share similarities with traditional transactions, they have distinctive features:
* **Additional Fields:** UserOperations incorporate new elements into the transaction structure, such as EntryPoint, Bundler, Paymaster, and Aggregator.
* **Separate Mempool:** Instead of the standard mempool, UserOperations are sent to an alternative mempool. Here, bundlers collate them into transactions for inclusion in a block.
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Today, transaction inputs are specific. For instance; '*Swap 2K USDC for 1 ETH*'
In contrast, UserOperations can be decorated with additional metadata to be more intent-focused. For instance; '*I want to trade 2K USDC for the most amount of ETH possible*'.
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