What is an applet designed to do?

The correct answer highlights that an applet is designed to perform a specific function. Applets are small application programs that are usually embedded within a larger program or web page. They are typically created to execute particular tasks, such as displaying information, handling user input, or enhancing the user interface in a focused manner.

While other choices involve important software functionalities, they don't specifically capture the primary purpose of an applet. Automating routine tasks is a feature seen in different types of applications, but this doesn't describe the limited scope and functionality of an applet. Enhancements to existing software can be achieved through various extensions or plugins, which may not align with the definition of an applet. Securing website communications pertains to encryption and security protocols rather than the functionality provided by applets. Therefore, the essence of an applet lies in its ability to execute a defined, singular function effectively.