open appimage in ubuntu code example

Example 1: what is this for .appimage

$ chmod a+x filename.AppImage
$ ./filename.AppImage

Example 2: appimage install kali linux

./exampleName.AppImage

Example 3: appimage install kali linux

$ chmod a+x Subsurface*.AppImage

Example 4: appimage install kali linux

$ ./Subsurface*.AppImage