What is "Literacy" to me

In the article, the writer mentioned about the “literacy as power.” and “Literacy as a state of grace.” Literacy is an abstract word that is hard to define. Generally, iteracy means the ability to read and write or the ability to use language proficiently. However, nowadays, I think the meaning of this word has been updated. Literacy does not just include the skill of the language using. Instead, it is the ability to do any study or obtain any infomation. For example, one can well sum up the knowledge and then present them. In this way, information is not just absorb but also has been used. Moreover, literacy can also used in mathmatics, computer, physics(...) instead of language because they are same in obtain and understand the knowledge.