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.
Files with the .7z extension are very similar to Zip files. These files are compressed archive files, usually created by the 7-Zip file archive utility. 7Z files can make it easier to send files and folders over email and the Web.
1 If the tar file is compressed, type 7z x filename.tar.gz at the command prompt (where filename.tar.gz is the name of the compressed tar file). This results in a tar file called filename.tar.  Type 7z x filename.tar at the command prompt (where filename.tar is the name of the tar file).