Final answer:
Activating lockdown on your iPhone enables a security feature that restricts access to your device and provides an extra layer of security to prevent unauthorized access to your personal data.
Step-by-step explanation:
When Lockdown Mode is enabled, some apps and features will function differently, including: Messages - Most message attachment types are blocked, other than certain images, video, and audio. Some features, such as links and link previews, are unavailable.
On your iPhone, it will enable a security feature that restricts access to your device. This feature can be helpful in situations when you want to prevent unauthorized access to your personal data.
When lockdown is activated, your iPhone may require a passcode or biometric authentication like Touch ID or Face ID to unlock the device. It may also disable certain functionalities like Siri or notifications on the lock screen.
This can provide an extra layer of security if you lose your iPhone or it gets stolen, as it will be more difficult for someone to access your information.