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A wireframe is a visual representation of a product's layout, structure, and functionality. It is a low-fidelity outline of the key components and features of a product. Wireframes are used to communicate design ideas and concepts to stakeholders, including developers, designers, and clients.

Wireframes are typically created during the early stages of product development, before any design or coding work has begun. They are often created using specialized software tools, such as Balsamiq, Sketch, or Adobe XD, but can also be created by hand using pen and paper.

Wireframes serve several purposes in product development. First, they help to establish a common understanding of the product's requirements and functionality among the project team. Second, they allow for quick iteration and refinement of design concepts. Third, they provide a basis for usability testing and feedback.

There are several types of wireframes, including:

- Low-fidelity wireframes: These are basic sketches that focus on layout and structure, rather than detailed design elements.
- Medium-fidelity wireframes: These include more detail and may include some design elements, such as colors and typography.
- High-fidelity wireframes: These are more detailed and may include actual images and content.

When creating wireframes, it is important to keep in mind the target audience and the product's goals. Wireframes should be simple, clear, and easy to understand. They should also be flexible enough to accommodate changes and revisions as the product evolves.

Overall, wireframes are an essential tool in product development, helping to ensure that the final product meets the needs of users and stakeholders.