Writing on the board (blackboard/whiteboard); especially the teacher's act of writing key points or diagrams during a lesson.
先生は重要な部分を黒板に板書したので、ノートをよく写した。
The teacher wrote the important parts on the blackboard, so I copied them carefully into my notes.
学生は板書を写すのに夢中で、先生の説明を聞き逃した。
Students were so busy copying the board notes that they missed some of the teacher's explanation.
板書をスライドにまとめて配布する授業も増えている。
There are more classes that compile board notes into slides and distribute them.