Literary theory can be defined as a series of analytical approaches used to understand literature. Some key points of the document include:
1) Literary theory questions common sense notions about concepts like meaning, language, writing and subjectivity. It aims to critically analyze these concepts.
2) Theory examines how meanings are constructed and achieved through language rather than just reflecting pre-existing ideas. It looks at literature as a cultural and historical construct.
3) Defining literature involves considering both its formal features like use of language as well as the contexts in which it is produced and received. Literature can have various functions from entertainment to teaching about the world.