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Embedded files
Combining different filetypes into a single file, such that the appropriate data is preserved with respect to how the file is being read. This is usually accomplished by concatenating the files together.
Compatible file types
It usually doesn't matter what the first file is, but it should be a GIF, JPEG, or PNG file if you want to post it to 4chan. The second file should be one of these types:
7ZIP, RAR, and ZIP files are blocked on 4chan, but the block can be circumvented using padding.
Examples
In Windows:
copy /B foo.jpg + bar.rar foobar.jpg
In *nix:
cat foo.jpg bar.rar > foobar.jpg
Both of these examples will create a file named foobar.jpg, that when viewed graphically is identical to foo.jpg, but when unrar'd contains the contents of bar.rar.
Why does it work?
Many types of compressed archives (ZIP, 7ZIP, RAR) can be distributed as self-extracting files, which are composed of an executable file concatenated with the archive. So these types of files are designed to be readable even if they're appended to another file.
Accidental file synthesis
Broken web pages occasionally append HTML to the end of the images they serve. In most cases, the contents are unremarkable. But several images from the diaper fetish website wetherbed.com contain the login credentials. These images are often reposted in diaper fetish threads on /b/ with the posters unaware of what's in them. You can find this information by opening the files in a text editor such as Wordpad, and searching for "password".