Why is HEVC better than H.264?

In macOS High Sierra and iOS 11, Apple will perform a new video encoding process technology, it is called “High-Efficiency Video Coding”, namely HEVC. It reduces video size and supports new high-resolution content while saving disk space. But what makes HEVC better than H.264? Also known as H.265, HEVC is a video compression standard designed for the latest generation of high-resolution video. It is the successor to the widely used…