A vertex is a point where two or more lines or edges meet. In geometry, it is commonly found in shapes like triangles, squares, and polygons. For example, a triangle has three vertices, while a square has four. Each vertex is a crucial part of the shape's structure, helping to define its overall form. In three-dimensional shapes, such as cubes or pyramids, vertices are also important. A cube has eight vertices, while a pyramid has a varying number depending on its base shape. Understanding vertices is essential in fields like geometry, computer graphics, and architecture, where precise shapes and structures are necessary.