This chapter is a review of literature related to the present investigation. Initially, definitions of vocabulary learning are discussed. Under this topic, the definition of word and vocabulary, the importance of vocabulary, and the importance of vocabulary learning goals are also defined. Second topic in this chapter involves approaches on learning vocabulary, and it is followed by types of vocabulary that this study covers. Finally, vocabulary learning strategies are reviewed as the last section of the chapter.
2.1 Vocabulary Learning
2.1.1 Defining Word and Vocabulary
2.1.2 The Importance of Vocabulary
2.1.3 The Importance of Vocabulary Learning Goals
2.2 Vocabulary Learning Approaches
2.3 Type of Vocabulary
2.4 Vocabulary Learning Strategies
2.4.1 Definition and Classification of Vocabulary Learning Strategies