According to Wikipedia, in geometry, the tesseract is the four-dimensional analogue of the cube; the tesseract is to the cube as the cube is to the square. Just as the surface of the cube consists of six square faces, the hypersurface of the tesseract consists of eight cubical cells. The tesseract is one of the six convex regular 4-polytopes.
But, my view of Tesseract is little different. Here I go with my explanation of tessaract. If you have seen the movie Interstellar, the tesseract concept is represented.