Internet cookies are not delicious treats that you can order from the world wide web: theyre text files with small pieces of data that identify your device and you as a user. Their main purpose is to help improve your web browsing experience by tracking and saving information from your web browsing sessions. But as they build up, they can impact your privacy and security. To enjoy a cleaner and more secure browsing experience, its worth deleting cookies on your iPhone from time to time. Luckily, its very simple to do.