E-commerce companies make money through various revenue streams, including:

1. Product Sales: The primary source is selling products online. E-commerce platforms allow businesses to showcase and sell their products to a wide audience.

2. Subscription Fees: Some e-commerce platforms charge sellers a subscription fee to use their services. This fee might include access to additional features, tools, or a certain number of listings.

3. Transaction Fees: E-commerce platforms often charge a percentage of each transaction as a fee. This is a commission for facilitating the sale on their platform.

4. Advertising and Promotions: Companies may generate revenue by offering advertising space on their platform or promoting products through sponsored listings.

5. Shipping and Fulfillment Services: E-commerce companies may provide fulfillment services for sellers, including storage, packing, and shipping of products. They can charge fees for these services.

6. Data Monetization: Some e-commerce platforms analyze user data to provide insights or targeted advertising. They may monetize this data by selling it to third parties or using it for their own advertising services.

7. Premium Features: Offering premium features or advanced tools for sellers at a subscription cost can be an additional revenue stream.

8. Affiliate Marketing: E-commerce companies may earn commissions by promoting third-party products through affiliate marketing programs.

9. Licensing and White Labeling: Licensing their technology or allowing other businesses to use their platform under a white-label arrangement can be another way to generate income.

Overall, the combination of these revenue streams contributes to the financial success of e-commerce companies.