Hd is related to High Definition movie files. You may open hd files with DVD players.
HD derived from High Definition words first letters. It stands for a system name. The resolution of HD videos is higher than the other videos. You may play the movies with high quality and large sizes with a DVD player. You can get detailed information from here
What to use hd
High Definition Film
which page related to hd file
hd Related Searches
You can check related links about hd fileextension.