In this final thesis we will focus on code-switching among the Croatian youth and the way English has made its way into their everyday vocabulary. This phenomenon has become so frequent and normalised, it is often unnoticed. The reasons Croatian adolescents and young adults switch codes are sociological and psychological. It allows them to be more informal, humorous, and simply true to their identity. Using another language can help people be more honest and comfortable with sharing their emotions. Another reason young people use English is because of the vocabulary they pick up on social media, video games and other forms of entertainment. Code-switching requires less mental strain than the process of thinking in one language, translating, and then uttering in another language. The research was conducted by using an observational approach because it ensured the subjects will not be aware of their language use and be spontaneous and informal. Code-switching examples were taken from everyday conversations and text messages on social media platforms. Young people adapt English words and phrases phonetically and morphologically to Croatian language, which is seen through pronunciation and spelling. Although this has become natural for the youth, older generations struggle with the changes in their vocabulary. Code-switching is an expected result of language interactions, but speakers should be aware of the global impact of English and the consequences it may have on their native language.