This study investigated the effectiveness of using YouTube videos as a brainstorming
medium in teaching and learning English vocabulary. Using a quasi-experimental
design with 30 eighth grade students from Hidayatullah Martapura Junior High School,
the class was divided into two groups with 1 group of 15 students each i.e. treatment
group and control group. Both groups took a vocabulary pre-test and post-test
consisting of 20 items. The treatment group was taught using YouTube videos as
Brainstorming media before the initial lesson to improve students' vocabulary, while
the control group received conventional instruction before starting the lesson. The
questions totaled 20 items with 3 different criteria, multiple choice, sentence structure,
and fill in the right word in a text, the questions were given during the Pre-Test (before
treatment) and Post-Test (after treatment) with different question contents. In
Treatment there will be 3 meetings in each group, with 3 different materials each
meeting (Verb-ing, preposition of place, describing people). Data were analyzed using
SPSS version 26, using normality test, independent sample t-test, paired sample t-test,
and N-Gain. The results showed a statistically significant increase in vocabulary
acquisition in the treatment group compared to the control group. The findings revealed
that YouTube-based brainstorming activities effectively improved students' vocabulary
proficiency. The findings support the integration of digital media and creative pre
learning strategies in the EFL classroom.