Define personal finance. What is a "common"?

Here are the definitions for your questions:

1. Personal finance refers to the management of an individual's or a family's financial resources. It involves activities like budgeting, saving, investing, and spending money to achieve financial goals and ensure financial well-being.

2. E-commerce (electronic commerce) is the buying and selling of goods and services, or the transmitting of funds or data, over an electronic network, primarily the internet. It encompasses a wide range of business activities, from online retail to online banking.