What is literacy?

What make human different from a animal is that they has the ability to think and comunicate. Not only can we just using speaking lauguage as the way of knowing things, we can aslo learn things from the record privious individrals leaving behind. Although there are many ways to do this record, just like a song, or a story telling from generation to generation. The most effecient way is what people can "see" and "keep" it, either by word or visualize. In my point of view, the ability to understand and create that kind of way of record is what it is called literacy, whose category can be various greatly. A book, a movie or articles published on internet can all be treated as a kind of literacy.