Code switching refers to alternating between two or more languages or language varieties in conversation. The document discusses some advantages and disadvantages of code switching. It states that code switching can help students draw from their experience and knowledge in their first language to learn English. However, some believe it can create confusion for students and interfere with proper language learning. Studies show that code switching is a natural part of bilingual communication and does not negatively impact language development when used appropriately. The document examines code switching in Malaysian English classrooms and its effects on English language learning.