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In linguistics, code-switching occurs when a speaker alternates between two or more languages, or language varieties, in the context of a single conversation.peakers form and establish a pidgin language when two or more speakers who do not speak a common language form an intermediate, third language. On the other hand, speakers practice code-switching when they are each fluent in both languages.
A switch with both types of contact is called a changeover switch. These may be  make-before-break  ( MBB  or shorting) which momentarily connects both circuits, or may be  break-before-make  ( BBM  or non-shorting) which interrupts one circuit before closing the other.