The English word for 日記 is “diary”. A diary refers to a medium used to record its contents, and it also refers to a notebook where daily occurrences and activities are recorded. The content of a diary is derived from our observations of life, so it can include observations, descriptions of people, scenery, and activities. A diary can be used to write stories and express emotions. It can also record things that happened today, observations, and dreams. Essentially, a diary is a record of what you see and feel in a day, organized in a logical and structural manner. A diary is a personal note arranged in chronological order. Initially, diaries were used for business purposes, but later people started using diaries to record weather and events, and even their personal thoughts and feelings. A diary can be used to record both future plans and past events.