The High Sierra installation package is distributed as a DMG (Disk Image) file, which is a compressed file format used by macOS. The DMG file contains the installation package and can be mounted as a virtual disk image on a Mac.
High Sierra also brings improvements to Siri, Apple's virtual assistant. Siri becomes more integrated with the operating system, allowing users to perform tasks such as sending messages, setting reminders, and making payments with greater ease.
Another significant update is the introduction of HEVC (High Efficiency Video Coding) video encoding, which provides better compression and higher quality video playback. This update is particularly important for content creators and consumers, as it enables smoother and more efficient video editing and playback.