2D shapes are flat figures that have only two dimensions: length and width. They do not have any thickness or depth. Common examples of 2D shapes include squares, circles, triangles, and rectangles. Each shape has its own unique properties, such as the number of sides and angles. These shapes can be found in everyday life, from the tiles on a floor to the pages in a book. Understanding 2D shapes is important in various fields, including art, design, and mathematics. They serve as the building blocks for more complex forms and structures.