Applet refers to a lightweight application, which can run directly on mobile devices without downloading and installing. They are applications in the application ecology based on platforms such as WeChat and Alipay, and provide users with simple and efficient ways to use them.

Applets have the following characteristics:

1. No need to download: users don't need to download and install on their mobile phones, just open applets on platforms such as WeChat and Alipay.

2. Lightweight: Compared with traditional applications, applets are lighter and occupy less storage space and system resources.

3. Quick access: Because there is no need to download, users can quickly access applets by scanning QR codes, searching and recommending.

4. Independent operation: applets have independent interfaces and functions, and can run independently in the platform without relying on other applications.

5. Rich functions: Although the functions of applets are simpler than traditional applications, they can still provide rich functions and interactive experiences to meet the basic needs of users.

Applets are widely used in business and personal fields, and can be used in various scenarios such as e-commerce, social media, online education and service reservation. Enterprises and developers can use applets to provide convenient services, increase user stickiness and increase brand exposure and sales through the promotion and marketing functions of applets.