In geometry, a vertex is a point where two or more lines, edges, or rays meet. For example, in a triangle, each corner where the sides come together is called a vertex. A shape can have multiple vertices; for instance, a square has four vertices. Vertices are important in various fields, including computer graphics and mathematics. In 3D modeling, vertices define the corners of shapes, helping to create complex structures. In graph theory, a vertex represents a node in a network, connecting to other vertices through edges. Understanding vertices is essential for analyzing shapes and networks.