Image credit to google
Image credit to google
This means the phone has a strong and fast internal "brain" (processor) that allows it to run apps smoothly, handle demanding tasks like gaming or video editing without lagging, and generally feel responsive.
A "latest processor" indicates it's using one of the newest and most advanced chips available.
Image credit to google
This implies a phone with a screen that can be folded or stretched, allowing you to use multiple apps simultaneously on different parts of the screen. For example, you could check your email on one half while watching a video on the other.