What features do you need in a diary?

In a diary, essential features include sufficient writing space for daily entries, a date or date range for easy reference, and a durable cover to withstand daily use. Additional features like prompts for reflection, inspirational quotes, or sections for goal-setting can enhance the writing experience. A secure closure, such as a strap or zipper, can help keep entries private. Lastly, a compact size is beneficial for portability, allowing users to carry it easily.