Itroduction of paypal, cashapp, venmo and zelle.

PayPal 

PayPal is a widely used online payment system that allows users to send and receive money via email transactions. Users can link their PayPal accounts to their bank accounts, credit cards, or debit cards, making it easy to make purchases online or transfer money.

Cash App Cash App is a mobile payment service developed by Block, Inc. It allows users to send, receive, and store money, as well as invest in stocks and Bitcoin. Cash App is popular for its user-friendly interface and quick transactions.

Venmo 

Venmo owned by PayPal, is a peer-to-peer payment app that makes it easy to split bills, pay friends, or cover shared expenses. Users can link their bank accounts, debit cards, or credit cards to send and receive money. Venmo also offers social features, allowing users to s