The PCI data flow diagram depicts PCI compliance. PCI compliance is a continuous process that helps prevent security breaches and payment card data theft both now and in the future; PCI compliance means you are contributing to a global payment card data security solution. This PCI data flow diagram depicts cardholder data flow across systems and networks. Cardholder data flow diagrams show where all cardholder data is stored, processed, or transmitted in the network. The PCI is a financial industry sector in charge of all electronic payments. Sensitive financial information is constantly sent to all parts of the world as purchases are made using debit, credit, ATM, POS, prepaid, and e-purse systems.