# Transaction Overview

The main purpose of any transaction is to move funds between parties. Each transaction has several inputs and outputs. [Account](https://docs.zkbob.com/implementation/account-and-notes/accounts) and [notes](https://docs.zkbob.com/implementation/account-and-notes/notes) can be used as inputs and outputs.

The current implementation assumes that each transaction has:

1. A single input and output account and 
2. A fixed number of input (3) and output (127) notes.

The input and output accounts designate a transaction initiator. Account changes (including balance, energy and spent offset) are reflected in the output account.