Projection techniques are methods used to represent three-dimensional objects on a two-dimensional surface, like a piece of paper or a computer screen. These techniques help us visualize complex shapes and structures by simplifying their appearance. Common examples include orthographic projection, which shows different views of an object without perspective, and perspective projection, which mimics how our eyes perceive depth and distance. In fields like architecture and engineering, projection techniques are essential for creating accurate drawings and models. They allow designers to communicate their ideas clearly and ensure that everyone involved in a project understands the dimensions and layout of the final product.