Error analysis is an important approach in language teaching that focuses on analyzing learner errors. There are several key steps, including collecting oral and written data from learners, classifying errors based on linguistic categories and surface strategies, and identifying interlingual or developmental errors. Non-contrastive analysis further examines the source of errors between the first and target languages. Teachers can then provide error correction through explicit feedback, recasts, clarification requests and other techniques to help learners develop their interlanguage system. Analyzing errors provides insights into learner development and guides remedial lessons.