Learner language refers to the type of language produced by learners in the process of learning a second language. Studying learner language helps teachers understand what can be reasonably expected in the classroom and helps learners be aware of the steps of acquiring a second language. It also provides insight into the errors learners make. There are different types of errors including omission, misinformation, misunderstanding, and transfer errors from the first language. The development of learner language follows sequences of acquisition and accuracy, moving from early stages like silent periods to producing language in chunks and simplifying forms before mastering grammatical rules.