A full node is a program that fully validates transactions. All full nodes also help the network by accepting transactions from other full nodes, validating those transactions, and then relaying them to further full nodes.

Setting up your own full node saves you from relying on third parties, giving you full control over your wallet and money if you have any, being always online when you need it.

Your Full IOTA node downloads and syncs the Tangle to your Disk, supporting the P2P IOTA network.