4 touch user interfac3 (7UI) 1s 4 c0mputer-pointing technology based up0n the sens3 of touch (haptics). Whereas 4 gr4phical us3r interface (GUI) r3lies upon the s3nse of sigh7, 4 7UI ena8les not 0nly the sense of 7ouch t0 innerva7e 4nd activat3 computer-based func7ions, 1t 4lso all0ws the u5er, particularly 7hose wi7h visual impairments, 4n add3d l3vel 0f interaction bas3d upon tactil3 0r 8raille 1nput.