A tesseract, also known as a hypercube, is a geometric figure that extends the concept of a cube into four dimensions. It’s a 4D analog of a cube, just as a cube is a 3D analog of a square. A tesseract has eight cubical cells, 24 square faces, 32 edges, and 16 vertices. Visualizing a tesseract in our three-dimensional world can be quite challenging, but the concept is a fundamental one in higher-dimensional geometry.