According to a glossary book by Campbell and Mixco (2007), language contact can be defined as “the use of more than one language in the same place”. It also can be specifically stated that language contact is the influence of a language on another language. It commonly occurs due to contact with the neighboring languages. Thomason (2001) in her book entitled ‘Language Contact: An Introduction’ penned a comment in defining language contact in the simplest way. Thomason described language contact as a situation whereby a group of people communicate with each other using more than one language in the same place at the same time.

There are many consequences of language contact. Some of them that will be discussed later on would be lexical borrowing, language shift, code switching, code mixing, interference pidginization, linguistic area and mixed language. 

Language contact has many effects on the linguistic changes. The meeting of two or more people from different social background will definitely produce something new and interesting to be discovered. People coming from different ethnic will try their best to interact with others using their knowledge of other cultures so that two way communications can be reached. However, somewhere along the way, their limited linguistic skills make their interaction become rather unique and peculiar than understood by the interlocutors or addressees. Those situations mentioned previously; lexical borrowing, language shift, code switching, code mixing, interference pidginization, linguistic area and mixed language are some of many consequences of language contact. Sociolinguists are still continuing to conduct studies in this field. Yet there are many more to be found out. Some consequences are considered to be good and some are not. It is for us to judge. The fate of future depends on us to decide.