Why are deadlines necessary, for example for work or study?

Deadlines are crucial because they create a sense of urgency that pushes people to focus and prioritize. Without them, tasks could drag on endlessly-I've seen this in my own work as a UI designer in Shanghai. When a project lacks a clear deadline, team members might keep refining small details instead of moving forward. For example, last month we had to finalize a client presentation, and setting a firm deadline forced us to make decisions rather than overthink every element. That said, unrealistic deadlines can backfire-they should allow enough time for quality work while still keeping momentum.