Photoshop is a powerful image editing software. It uses layers, which are like transparent sheets that hold parts of an image. Layers can contain images, text, and vectors, and are controlled in the layers pane. Common tools in Photoshop include selection tools, painting tools, and navigation tools. Photoshop is useful for landscape design as it allows digital drafting that is faster than hand drawing and allows for revisions, multiple versions, and reuse of design elements.