Needlepoint Canvas is woven as a square netting and used for cushion making, latch hooking and knotting. You can also use it to make giant cross stitches.
Interlock canvas has twisted threads which are locked together at the intersections. This ensures that the fabric stays in shape, even when you use tight tension. It will not easily distort during stitching or knotting.
Penelope fabric is also called double canvas. You can use this canvas to stitch both petit point (small needlepoint stitches) and gros point (large needlepoint stitches) on the same design.