Tren Warfare / What was Trenches used for in world war one?

This term we have been learning about WW1. Our topic was to learn about why were trenches used in world war one and why did the soldiers need to use it fighting against other nations. For this task we needed to work in our partners that we worked in through the other lessons about world war one. There were 3 videos to watch about trenches and 1 article. Me and my Partner fau watch all 3 videos and kinda read bits of the Article. We mostly got information from the video because it show how and why.