This study focused on UNIMED Biology Department students and aimed to find Indonesian language errors in their WhatsApp conversations with lecturers. The data included messages sent by UNIMED biology students to lecturers via WhatsApp. A qualitative analysis was conducted to compare this data with language error standards set in good and correct Indonesian language rules, such as EYD, PUEBI, and KBBI. The results showed that some of the language mistakes that often occur in conversation include incorrect word use, incorrect punctuation, and ineffective sentences

This research was conducted by describing what happened in the field regarding the use of prokem language among students and the existence of Indonesian language at this time. The first research objective is the reason students use prokem language, secondly how often students use prokem language, thirdly the impact of using prokem language on the existence of Indonesian language. The research method used is descriptive qualitative method with data collection techniques in the form of interviews with students majoring in geography education at Medan State University, observation and literature study to provide supporting data from the analysis of data obtained in the field. The results and discussion obtained that students today are very often using prokem language in daily communication and in the campus environment, the reason they use prokem language is because they want to be up to date and follow current trends. The negative impact of prokem language results in a decrease in the existence of good and correct Indonesian in today's society and this also has a negative impact on the quality of writing and speaking of students as an academic

In this study, quantitative methods using structured questionnaires were used to assess the impact of slang use on good and correct Indonesian use among Generation Z. The study participants consisted of 35 people from Generation Z. Data analysis concluded that although the majority of respondents admitted to using slang in daily life, awareness of the importance of using Indonesian formal language still remained high. The results showed that the use of slang did not have a significant effect on the participants' ability to use Indonesian words accurately. This highlights that although Gen Z generally embraces slang culture, Indonesian is still considered important in the context of communication. Therefore, continuous efforts are needed to encourage the use of Indonesia's official language in various communication situations. Therefore, continuous efforts are needed to encourage the use of Indonesia's official language in various communication situations. A follow-up study examined the impact of slang use on Generation Z's interpersonal and professional communication, and highlighted that although slang has an interesting cultural influence, awareness of formal language use remains relevant.