A wizard interface is a user interface pattern that guides users through a complex process or task by breaking it down into a series of simple, step-by-step interactions. It's called a "wizard" because it leads the user through the process like a wizard leading an apprentice.

A wizard interface typically consists of:

1. A series of screens or pages, each representing a single step

2. A clear and concise instruction or prompt for each step

3. User input fields or controls to collect necessary information

4. Navigation buttons (e.g., "Next", "Back", "Finish")

Use a wizard interface when:

1. Complex tasks need to be simplified

2. Users may be overwhelmed by multiple options or inputs

3. A process requires sequential steps

4. User guidance and feedback are crucial

5. Error prevention and validation are necessary

Examples of when to use a wizard interface:

1. Installation or setup processes

2. Configuration or customization tasks

3. Data import or export processes

4. Complex form submissions (e.g., tax returns, loan applications)

5. Onboarding or tutorial processes for new users

By using a wizard interface, you can make complex tasks more manageable, reduce user errors, and improve overall user experience.