ABSTRAK Corona Virus Disease 2019 (Covid-19) merupakan penyakit menular yang disebabkan oleh SARS-CoV-2. WHO resmi menyatakan bahwa Covid-19 adalah suatu pandemi dan merupakan masalah kesehatan dunia. Angka kejadian Covid-19 di Indonesia semakin hari semakin meningkat dikarenakan tingkat pengetahuan terhadap pencegahan Covid-19 pada masyarakat masih kurang. Pencegahan yang dimaksud adalah melakukan 5M dan 3T, serta menjalankan program vaksinasi. Tujuan untuk meningkatkan pengetahuan dan pemahaman masyarakat tentang pencegahan dan vaksin Covid-19. Metode menggunakan metode penyuluhan dengan cara ceramah dan demostrasi dalam bentuk webinar melalui aplikasi zoom. Pembicara memberikan webinar tentang pencegahan dan vaksin Covid-19. Sebelum mengikuti webinar masyarakat diuji pengetahuannya dengan mengikuti pre-test. Setelah webinar, masyarakat kembali diuji pengetahuannya dengan mengikuti post-test. Hasil analisis pada pre-test terdapat hanya 35% peserta yang mengerti dan memahami tentang pencegahan dan vaksin Covid-19, sedangkan pada post-test ditemukan 95% peserta sudah mengerti dan memahami tentang pencegahan dan vaksin Covid-19. Berdasarkan hasil dapat disimpulkan bahwa webinar ini meningkatkan pengetahuan dan pemahaman masyarakat tentang pencegahan dan vaksin Covid-19. Kata Kunci: Webinar, Pencegahan dan Vaksin Covid-19, Masyarakat ABSTRACT Corona Virus Disease 2019 (Covid-19) is an infectious disease caused by SARS-CoV-2. WHO officially declares that Covid-19 is a pandemic and is a global health problem. The number of cases of Covid-19 in Indonesia is increasing day by day because the level of knowledge about preventing Covid-19 in the community is still lacking. Prevention is meant to do 5M and 3T, and run a vaccination program. Objective to increase public knowledge and understanding about Covid-19 prevention and vaccines. Methods using the extension method by way of lectures and demonstrations in the form of webinars through the zoom application. The speaker gave a webinar on Covid-19 prevention and vaccines. Before participating in the webinar, the community's knowledge is tested by taking a pre-test. After the webinar, the community's knowledge was again tested by taking a post-test. The results of the analysis in the pre-test there were only 35% of participants who understood and understood about Covid-19 prevention and vaccines, while in the post-test it was found that 95% of participants already understood and understood Covid-19 prevention and vaccines. Based on the results, it can be concluded that this webinar increases public knowledge and understanding about Covid-19 prevention and vaccines. Keywords: Webinar, Covid-19 Prevention and Vaccine, Society