Code-mixing refers to the mixing of two or more languages or language varieties in speech.
Some scholars use the terms "code-mixing" and "code-switching" interchangeably, especially in studies of syntax, morphology, and other formal aspects of language. Others assume more specific definitions of code-mixing, but these specific definitions may be different in different subfields of linguistics, education theory, communications etc.
Code-mixing is similar to the use or creation of pidgins; but while a pidgin is created across groups that do not share a common language, code-mixing may occur within a multilingual setting where speakers share more than one language.
Read more about Code-mixing: Code-mixing As Code-switching, Code-mixing in Sociolinguistics, Code-mixing in Language Acquisition, Code-mixing in Psychology and Psycholinguistics, Code-mixing As Fused Lect