A binary file is a computer file which may contain any type of data, encoded in binary form for computer storage and processing purposes.
A binary file is a computer file that is not a text file. It may contain any type of data, encoded in binary form for computer storage and processing purposes.
Many binary file formats contain parts that can be interpreted as text. for example, some computer document files, word file, office files, contain the text of the document but also contain formatting information in binary form.
Source: Wikipedia (Binary file)