A hexagon is a polygon with six edges and six vertices.
The internal angles of a regular hexagon (one where all sides and all angles are equal) are all 120°. Like squares and equilateral triangles, regular hexagons fit together without any gaps to tile the plane (three hexagons meeting at every vertex), and so are useful for constructing tessellations. The cells of a beehive honeycomb are hexagonal for this reason and because the shape makes efficient use of space and building materials.
There is no platonic solid made of regular hexagons. The archimedean solids with some hexagonal faces are the truncated tetrahedron, truncated octahedron, truncated icosahedron (of soccer ball and fullerene fame), truncated cuboctahedron and the truncated icosidodecahedron.
L'Hexagone is an epithet of France, owing to the country's shape. A regular hexagon is depicted on France's one- and two-euro coins.
A polygon with five sides is a pentagon, and a polygon with seven sides is a heptagon. A polygon with nine sides in a nonagon.
See also: synthetic geometry