Feature aggressive pop-up advertisements or tracking scripts.
This is the source or branding tag for the website or "release group" that encoded and uploaded the file. Groups often include their URL to claim credit and drive traffic to their platforms.
Standing for High Efficiency Video Coding (also known as H.265), this is a modern compression standard. It allows the video to maintain high quality while being roughly half the file size of the older H.264 standard.
This is the audio codec (Advanced Audio Coding), a standard format for lossy digital audio compression that provides better sound quality than MP3 at similar bitrates.
When you see a string like this, it is designed to tell a viewer exactly what quality and format to expect before they open the file: