In the YouTube video titled "iOS 17 - TOP Features YOU HAVE TO KNOW!!!", the host highlights some amazing new features of iOS 17. One of the standout features is the AI voice cloning tool, which allows your device to speak for you in your own voice. Another exciting feature is the bedside clock mode, turning your iPhone into a convenient clock. Additionally, iOS 17 offers hidden customization options, including the ability to create custom stickers from your images and use them in messages. The stickers can even have interactive effects and be used in third-party apps like WhatsApp. One of the biggest hits of the update is the contact poster feature, where you can customize your contact's display image when you call them. With numerous options for customization, such as using a photo, emoji, or monogram, you can create a unique and personalized contact poster. Overall, iOS 17 introduces a range of innovative and exciting features that enhance the user experience.