There are many definitions of information literacy, but the one most often cited is this statement promulgated by the American Library Association:
“Information literacy is a set of abilities requiring individuals to recognize when information is needed and have the ability to locate, evaluate, and use effectively the needed information." Information Literacy Competency Standards for Higher Education. American Library Association. 2006.
"Information literacy is common to all disciplines, to all learning environments, and to all levels of education. It forms the basis of lifelong learning" (Association of College and Research Libraries, Task Force on Information Literacy Competency Standards, 1999)