Mesh, netting and tulle are sheer fabrics similar to lace, but do not have a specific woven design. They can come in prints or solids and can also have embroidery or fabric sewn on the surface. They are great for special occasion garments but can be found in a lot of ready-to-wear garments as well including overlays on tops, skirts and dresses.
Mesh knit usually has spandex mixed with it to make it stretch and have recovery. Netting and Tulle do not usually have spandex.