Concealed means that the weapon cannot be visible, and that its presence cannot be discernible through ordinary observation. It is a criminal offense for a license holder to carry a handgun in plain view, or to intentionally fail to conceal the weapon.
As of January 1, 2016 Texas is an open carry state. A License to Carry (LTC) is still required to carry a handgun openly or concealed in public, in some instances conceal carry may be the only option and businesses need to have legal and correct signage. Know your rights and know the laws.