A: 4K â also known as UHD (more on this in the next answer!) â is a picture technology that quadruples the number of pixels found in a full HD picture. These pixels are usually arranged in a 3,840 x 2,160 configuration, compared with the 1920x1080 you get in a full HD TV.
A file with the 7Z file extension is a 7-Zip Compressed file. Other types of files may also use the 7Z file extension. If you know of any additional file formats that use the .7Z extension, please let me know so I can update this information.
A .gz file is a compressed file. The extension .gz stands for GNU Zip. You have probably heard of the GNU Project, or GNU Linux, and you may also know how to open a Zip file. GNU Zip or .gz is a free GNU software implementation of a compression algorithm.