Literary criticism, as defined in the Oxford Dictionary of English, is "the art or practice of judging and commenting on the qualities and character of literary works."
"Criticism" doesn't necessarily mean to criticize or find what is wrong with a work. Literary criticism helps to explain or interpret a novel, a poem, a play, a story -- any work of literature.
A little confused about literary criticism/critical theory? Take a look at some of these titles to get an introduction and better understanding of the topic. They are located on the third floor of the library in the Main Collection.