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.
txz is short for tar.xz. tar.xz is an archive created with tar and xz utilities; contains one or more files first archived using tar and then compressed using xz compression; compressed using a high compression ratio. Beginning with Slackware 13, TXZ files are used to distribute Slackware Linux packages.