Making money in addition to a regular income can have a big impact on your finances. An extra $500 per month could go a long way in paying down debt or raising your investment. Diversifying your income streams is important, especially as wage remain stagnant. You decide how you want to produce the income. Either you ‘do something’ to generate the income- this is active income such as providing a service; or the income is generated without you having to ‘do anything,’ – this is passive income such as hosting an Airbnb. Just make sure you do not place all your eggs in one basket.
For a person working for a wage, their source of income is their job, or their labor (aka their time that they sell to someone). But you can own a house, and rent it out, and when your renters pay you renter every month, the source of that income check is your rental property, or your house. It would just be called rental income. If you have money in the bank in an account that pays interest, those interest payments are another source of income. We can say the source is interest payments, or we can identify the asset that is generating rent, and say your money in the bank that is generating “rent” (aka interest) is your source of income.