Mega Man X (ロックマンX, Rockman X), released in late 1993 by Capcom, is the first game in the Mega Man X series. The first subseries of the popular Mega Man series, it was made primarily as a stepping stone between the NES and SNES incarnations of the original series, as Mega Man games were released on the NES as late as 1994.

The game was first released on the SNES; it was published for the console by Capcom in the US and Japan, and later published in Europe by Nintendo that same year. It was then ported to the PC in 1995, remade in 2006 as Mega Man Maverick Hunter X (Irregular Hunter X in Japan), for the PlayStation Portable, and re-released on January 10, 2006 as part of the Mega Man X Collection for the Nintendo GameCube and the PlayStation 2.

Source: Wikipedia