ScummVM is a program which allows you to run certain classic graphical point-and-click adventure games, provided you already have their data files. The list of supported games is quite substantial—see the main ScummVM site for the full list.
This site covered the port of ScummVM to the Android phone platform during its development. The port is now accepted into the main ScummVM codebase, so you should probably continue your query on the main ScummVM website.
You probably want to go and read the FAQ now.