Portal primarily refers to:
Portal , a gate or door
Portal , a magical or technological doorway that connects two distant locations
Portal may also refer to:
Computing
Web portal, a site that functions as a point of access to information on the Internet
Enterprise portal, a framework to provide a single point of access to a variety of information and tools
Portal Software, a company based in Cupertino, California
Portal rendering, an optimization technique in 3D computer graphics
Video games
Portal , a first-person puzzle game produced by Valve Corporation
Portal , a series about MMORPGs
Portal , an early interactive novel for the PC and Amiga
Music
Portal , an independent progressive metal band from Canada
Portal , an ambient/dreampop band from the UK
People
Antoine Portal, French anatomist, doctor and medical historian
Charles Portal, 1st Viscount Portal of Hungerford, British Marshal of the RAF and Chief of the Air Staff in World War II
Mich
Source:
http://en.wikipedia.org/wiki/Portal