How we can hide several different files inside the single image file

Copy command of DOS and Windows Command Line allows us to copy one or more files to an alternate location. Using a simple little command to copy multiple files to one location, this trick basically works by merging a compressed file with an image. In other words, you can save your top-secret files inside an image by saving them both into one file.. Using this command it is possible to hide some RAR files inside images. A single PNG file can contain more than a single image.
Image viewing program displays correctly image file that hides within itself many other files. However, to access the files hiden in it, you should change image files extension to .rar extension or open it with use of WinRAR. The contents should be displayed in the application.
The choose of RAR and PNG formats is not random: the PNG file contains an header on the start of the file telling how many bytes the image file contains. This allows to display the image in image viewers and ignore the contents after it. On the other hand, the WinRAR program is smart enough to ignore the start of the file (containing an image) and display successfully the contents of the RAR file. In fact, WinRAR looks for "Rar!" sequence in the image file, knowing that from that point onwards is the data corresponding to the archive.
The Code
copy /B myphoto.png + secretFIles.rar newfile.png

The command 'copy' simply copies the 2 files to 1 location: resulting in merging them together.
'/B' just means the files are binary.
'myphoto.png' is the photo we want to use to hide files inside.
'secretFIles.rar' is the compressed file we want to keep hidden.
newfile.png' is the final file we want to create.