1. It makes pouring easier: When you pour liquid from a bottle without a tip, it can be hard to control the flow and you may end up spilling some. With a tip, however, the liquid comes out in a smooth, steady stream, making it much easier to pour without making a mess.

2. It prevents contamination: A bottle without a tip can easily be contaminated by whatever it comes into contact with, whether it's your hands or another surface. A tip helps to keep the opening of the bottle clean and free from germs and bacteria.

3. It preserves the contents: Some liquids, like wine and olive oil, can be negatively affected by exposure to air. A tip helps to minimize the amount of air that comes into contact with the liquid, which can help to preserve its quality and flavor.

4. It looks better: Let's be honest, a bottle with a tip just looks nicer than one without. It adds a finishing touch that makes the bottle look more professional and appealing.

Overall, putting a tip on a bottle is a simple yet effective way to improve its functionality, cleanliness, and appearance.