Vertex Painting is a simple way of painting color onto an object, by directly manipulating the color of vertices, rather than textures, and is fairly straightforward -- The Blender Manual. Use this tag for questions about using vertex painting in Blender.

The Blender manual describes Vertex Painting thusly

Vertex Painting is a simple way of painting color onto an object, by directly manipulating the color of vertices, rather than textures, and is fairly straightforward.

Vertex Painting is accomplished by selecting an object and entering Vertex Paint mode in the 3D Viewport.

Use this tag for questions about using vertex painting in Blender.