A tessellation is created when a plane is covered by repeating geometric shapes, called tiles, that fit together perfectly without any overlaps or gaps. This covering repeats over and over, filling the surface continuously. Common shapes that can form regular tessellations include equilateral triangles, squares, and regular hexagons. Tessellations can be regular, semi- regular (using more than one type of regular polygon), or irregular, and they occur both in nature and in human-made designs. The concept is widely used in geometry, art, and architecture to explore patterns, symmetry, and spatial organization.